WO2001024338A1 - Procede de fonctionnement d'un disjoncteur - Google Patents

Procede de fonctionnement d'un disjoncteur Download PDF

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Publication number
WO2001024338A1
WO2001024338A1 PCT/DE2000/003260 DE0003260W WO0124338A1 WO 2001024338 A1 WO2001024338 A1 WO 2001024338A1 DE 0003260 W DE0003260 W DE 0003260W WO 0124338 A1 WO0124338 A1 WO 0124338A1
Authority
WO
WIPO (PCT)
Prior art keywords
voltage
circuit breaker
threshold value
supply network
value
Prior art date
Application number
PCT/DE2000/003260
Other languages
German (de)
English (en)
Inventor
Wolfgang Röhl
Ulrich BAUMGÄRTEL
Holger Hochgraef
Original Assignee
Siemens Aktiengesellschaft
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 Siemens Aktiengesellschaft filed Critical Siemens Aktiengesellschaft
Publication of WO2001024338A1 publication Critical patent/WO2001024338A1/fr

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Classifications

    • 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
    • H02H3/006—Calibration or setting of parameters

Definitions

  • the invention relates to a method for operating a circuit breaker in a supply network, the circuit breaker for protection against the effects of short-circuit currents having an electronic overcurrent release with undelayed tripping above a threshold value of the current and the threshold value being at most applicable to the rated voltage of the circuit breaker
  • the switching capacity is adjustable.
  • circuit breakers e.g. Low-voltage circuit breaker, operated in such a way that the switching capacity of the circuit breaker in question applies to the rated voltage plus a safety margin for the instantaneous tripping as the maximum threshold value.
  • the voltage can deviate significantly from the rated voltage downwards. Since the switching capacity of a circuit breaker is dependent on the voltage, the case may therefore arise that the actual switching capacity of the circuit breaker is not used and a trip occurs prematurely or unnecessarily.
  • the object of the invention is to improve the selectivity of circuit breakers and to avoid unnecessary tripping in the event of a short circuit.
  • the maximum size of the threshold value can be changed by an automatic device as a function of the voltage existing in the supply network. It is achieved by the invention that the setting of the instantaneous tripping on the overcurrent release of the circuit breaker to the maximum value leads to a behavior which is adapted to the voltage present in each case and thus triggers automatically at a higher short-circuit current when the voltage is lower than the rated voltage of the circuit breaker , This avoids unnecessary tripping, which improves the selectivity and results in low-interference operation.
  • the method according to the invention can be carried out in such a way that the voltage existing in the supply network is measured periodically, compared with the rated voltage of the circuit breaker and a change in the maximum size of the threshold value is effected in such a way that at a lower voltage than the rated voltage in Supply network a higher maximum size of the threshold value is set. It is advisable to carry out both the periodic measurement of the voltage and the setting of the threshold value as subroutines in the operation of a microprocessor device of the electronic overcurrent release.
  • the aforementioned automatic device can be a component of the electronic overcurrent release of the circuit breaker and is thereby formed by the microprocessor device.
  • the automatic device for relieving the microprocessor device which is concerned with the protective tasks of the overcurrent release can be formed by an independent electronic unit which is assigned to the microprocessor device.
  • the measured value of the voltage available for processing in the aforementioned automatic device is very small or zero. This can be caused by an accidental lack of voltage at the moment of the last measurement or a serious be disturbance in the supply network, especially a short circuit. Therefore, there may be concerns about using such a measured value as the basis for the intended evaluation, with the result that the threshold value, ie the instantaneous tripping of the circuit breaker, is set to the highest possible switching capacity.
  • incorrect settings of the overcurrent release can be avoided in the aforementioned cases by subjecting the measured value of the voltage to be processed in the automatic device to a validity test in such a way that voltages with very small values or the value zero are evaluated as invalid and that the maximum threshold value is set to a low value if the relevant measured value of the voltage is found to be invalid.
  • the provision of measured values of the voltage is necessary. This can be done in a known manner by arranging a voltage converter in the switchgear assembly, of which the circuit breaker is a component. Since the current transformers or current sensors required to control the electronic overcurrent release are generally part of the circuit breaker, it is then only necessary to connect the voltage transformers to the circuit breaker in order to enable the described method. For the creator or operator of a switchgear, however, it can be advantageous to use circuit breakers which have their own voltage sensor for detecting measured values of the voltage in the supply network. The user then has the option of using the same voltage sensor for the purposes of power measurement and to enable a corresponding display on the circuit breaker.
  • the invention is described below with reference to an embodiment shown in the figures and the ones running therein
  • FIG. 1 illustrates in a schematic diagram changes in the voltage in a supply network and their effects on the switching capacity of a circuit breaker.
  • FIG. 2 shows the method according to the invention as a flow diagram.
  • FIG. 3 shows a circuit breaker for the method according to the invention in a schematically simplified manner.
  • the left part shows the course over time of a voltage u (t) prevailing in a supply network, as detected by a voltage sensor in the supply network or on the main current path of a circuit breaker (see FIG. 3, the main current path H and the sensors IS and US).
  • the changes in the voltage u (t) compared to a normal or rated voltage U r shown in broken lines can be caused in a known manner by changing loads on consumers, a very extensive network and / or the properties of the energy producers feeding the supply network.
  • the maximum value of the voltage occurring in the supply network is U m a / the minimum value is Umi. designated.
  • a voltage U 0 which is still below the voltage U m _ n and can occur, for example, in the event of a short circuit in the supply network.
  • the starting point in step SI is a periodic detection of the voltage in the supply network, as can be determined at the location of the circuit breaker.
  • the measured voltage values U m are then subjected to a check in step ⁇ 2 as to whether they are lower than the rated voltage Ur of the circuit breaker. If this is not the case and a further check in step S3 shows that the measured value U m is on the other hand not greater than the rated voltage U r , the maximum threshold value for the instantaneous triggering does not require any change. This is indicated by a horizontal arrow in result step S4.
  • step S3 If, on the other hand, the test in step S3 has shown that the measured voltage Um is above the rated voltage, the maximum value Ikmax is reduced to avoid endangering the circuit breaker. Accordingly, the result step S5 shows an arrow pointing downward.
  • Voltage U m is less than the rated voltage U r and a subsequent additional test in a step S ⁇ has shown that the voltage U m is not below a lower limit.
  • an arrow pointing upwards is shown for increasing the maximum value of the undelayed triggering.
  • step S6 the measurement of a very low voltage in step S6 gives rise to the assumption that there is a fault in the supply network and, consequently, see triggering is desired. Therefore in this case the
  • the maximum value of the instantaneous triggering is set to a low value, as is indicated in the result step S8 by a downward-pointing double arrow. On the contrary, a very high maximum value would be set if the measured low voltage were processed in the automatic device without evaluation or checking for validity.
  • FIG. 3 shows a low-voltage circuit breaker LS with an automatic device for adapting the maximum value for the instantaneous tripping.
  • Switching contacts are actuated by means of an energy store ES, a drive and latching device AV being controllable by a microprocessor device MPE, around the switching contacts SK to separate.
  • Signals dependent on the current and the voltage of the main current path H of the circuit breaker LS are fed to the microprocessor device MPE.
  • current sensors IS and at least one voltage sensor US are arranged in the main current path H.
  • An automatic device SE for changing the maximum value Ima for the instantaneous triggering is shown as a component or subunit or module of the microprocessor device MPE.
  • the automatic device SE can also be formed by an independent electronic unit which interacts with the microprocessor device MPE. Furthermore, the voltage sensor US can be arranged outside the circuit breaker LS if no suitable space is available in the circuit breaker or for other reasons a device for voltage measurement is already present in the switchgear.

Landscapes

  • Emergency Protection Circuit Devices (AREA)

Abstract

L'invention concerne un procédé de fonctionnement d'un disjoncteur (LS) permettant d'adapter la valeur seuil maximale (Ikmax) d'un déclenchement à action instantanée à la tension existant respectivement dans le réseau d'alimentation. Pour ce faire, la tension (Um) est mesurée périodiquement et comparée à la tension de dimensionnement (Ur) du disjoncteur. Si la tension mesurée (Um) est inférieure à la tension de dimensionnement (Ur), la valeur seuil maximale (Ikmax) du déclenchement à action instantanée est augmentée, car la puissance de coupure de disjoncteurs augmente au fur et à mesure que la tension baisse. De très faibles tensions sont évaluées comme un signe de défaut dans le réseau d'alimentation et entraînent le réglage d'une valeur seuil plus faible.
PCT/DE2000/003260 1999-09-30 2000-09-15 Procede de fonctionnement d'un disjoncteur WO2001024338A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE1999148688 DE19948688A1 (de) 1999-09-30 1999-09-30 Verfahren zum Betrieb eines Leistungsschalters
DE19948688.3 1999-09-30

Publications (1)

Publication Number Publication Date
WO2001024338A1 true WO2001024338A1 (fr) 2001-04-05

Family

ID=7925067

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE2000/003260 WO2001024338A1 (fr) 1999-09-30 2000-09-15 Procede de fonctionnement d'un disjoncteur

Country Status (2)

Country Link
DE (1) DE19948688A1 (fr)
WO (1) WO2001024338A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7861103B2 (en) 2007-04-04 2010-12-28 International Business Machines Corporation Dynamically configuring overcurrent protection in a power supply
US8217531B2 (en) 2008-07-24 2012-07-10 International Business Machines Corporation Dynamically configuring current sharing and fault monitoring in redundant power supply modules

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4124344A1 (de) * 1991-07-23 1993-01-28 Dold & Soehne Kg E Stromwaechter fuer niedervoltanlagen, insbesondere niedervolt-beleuchtungsanlagen
GB2261127A (en) * 1991-10-31 1993-05-05 Hakuju Inst For Health Science Electric field therapy apparatus
US5648887A (en) * 1994-06-09 1997-07-15 Warn Industries, Inc. Electric current limiting device for winch responsive to multiple device states

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4124344A1 (de) * 1991-07-23 1993-01-28 Dold & Soehne Kg E Stromwaechter fuer niedervoltanlagen, insbesondere niedervolt-beleuchtungsanlagen
GB2261127A (en) * 1991-10-31 1993-05-05 Hakuju Inst For Health Science Electric field therapy apparatus
US5648887A (en) * 1994-06-09 1997-07-15 Warn Industries, Inc. Electric current limiting device for winch responsive to multiple device states

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7861103B2 (en) 2007-04-04 2010-12-28 International Business Machines Corporation Dynamically configuring overcurrent protection in a power supply
US8217531B2 (en) 2008-07-24 2012-07-10 International Business Machines Corporation Dynamically configuring current sharing and fault monitoring in redundant power supply modules
US9214809B2 (en) 2008-07-24 2015-12-15 Lenovo Enterprise Solutions (Singapore) Pte. Ltd. Dynamically configuring current sharing and fault monitoring in redundant power supply modules

Also Published As

Publication number Publication date
DE19948688A1 (de) 2001-04-05

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