EP0142022B1 - Dispositif pour l'interruption de courants - Google Patents

Dispositif pour l'interruption de courants Download PDF

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Publication number
EP0142022B1
EP0142022B1 EP84112088A EP84112088A EP0142022B1 EP 0142022 B1 EP0142022 B1 EP 0142022B1 EP 84112088 A EP84112088 A EP 84112088A EP 84112088 A EP84112088 A EP 84112088A EP 0142022 B1 EP0142022 B1 EP 0142022B1
Authority
EP
European Patent Office
Prior art keywords
phase
zero
current
phases
switched
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.)
Expired
Application number
EP84112088A
Other languages
German (de)
English (en)
Other versions
EP0142022A1 (fr
Inventor
Masatoshi Nakazimi
Tadashi Dipl.-Ing. Morita
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 Co Ltd
Original Assignee
Fuji Electric Corporate Research and Development 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 Corporate Research and Development Ltd filed Critical Fuji Electric Corporate Research and Development Ltd
Priority to AT84112088T priority Critical patent/ATE26773T1/de
Publication of EP0142022A1 publication Critical patent/EP0142022A1/fr
Application granted granted Critical
Publication of EP0142022B1 publication Critical patent/EP0142022B1/fr
Expired legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/54—Circuit arrangements not adapted to a particular application of the switching device and for which no provision exists elsewhere
    • H01H9/56—Circuit arrangements not adapted to a particular application of the switching device and for which no provision exists elsewhere for ensuring operation of the switch at a predetermined point in the ac cycle
    • H01H9/563—Circuit arrangements not adapted to a particular application of the switching device and for which no provision exists elsewhere for ensuring operation of the switch at a predetermined point in the ac cycle for multipolar switches, e.g. different timing for different phases, selecting phase with first zero-crossing
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
    • H01H33/006—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means adapted for interrupting fault currents with delayed zero crossings

Definitions

  • the invention relates to an arrangement for switching off currents, preferably short-circuit currents, in three-phase networks in which the current of one phase does not initially go through zero, by means of switches which are separate for the phases and controlled by a current detection device with current zero-crossing detection devices.
  • a selective zero-protection device is followed by a current zero crossing indicator, which is a blocking device, which is interposed between the separate switch for each phase and the selective protection device, only after at least one zero crossing the current flowing through the circuit breaker ineffective.
  • a current zero crossing indicator which is a blocking device, which is interposed between the separate switch for each phase and the selective protection device, only after at least one zero crossing the current flowing through the circuit breaker ineffective.
  • the arrangement according to the invention is characterized in that the current detection device determines that of the two phases going through zero, in which the difference between the adjacent time intervals, which are defined by three successive zero crossings, is greater than in the other phase and the phase in which the difference is larger, switches off first. By switching off this corresponding phase, both other phases are forced to go through zero, so that the currents can extinguish relatively quickly in the zero crossing. In order to further reduce the current carrying capacity of the switch, it can be advantageous if the last two phases to be switched off are switched off with a time delay, since the two last phases to be switched off can then be switched at zero crossing.
  • the current detection device consists of zero-crossing detection devices assigned to each phase, to which integrators which can alternately be excited and stopped at the zero crossing are connected, the outputs of which are fed to a comparator common to all phases via an absolute value generator.
  • Fig. 1 shows the waveform of short-circuit currents in three phases, the current flowing in phase T not crossing the zero line.
  • the current in phase R reaches zero at times A, B, E, F etc., whereas the current with phase S becomes zero at times C, D, G, H.
  • the difference between the distances defined by the times A, B and B, E is smaller than that of the distances defined by the times C, D and D, G.
  • phase S the current in phase S that previously went through zero will be the one that no longer has zero contact, so that phases S and T no longer go through zero, as shown in FIG 2 is shown.
  • phase S and T also have, as in the example according to FIG. no more zero crossing.
  • phase S If the current is switched off first in a phase where the absolute value of the difference between adjacent, defined distances of the zero crossings is greater - this is in phase S, as shown in FIG. 4 - at the first zero crossing at point C. the currents in the remaining two phases - phase R and T - waveforms that cross the zero line.
  • FIG. 5 shows a case in which - as in the example according to FIG. 4 - the current in phase S is first switched off, specifically at zero crossing D. In this case, the currents of phases R and ⁇ cross as in the example according to FIG 4 - the zero line.
  • a three-phase short-circuit current that has a non-zero phase can be switched off by conventional AC switches or semiconductor AC switches by first switching off the current in the phase that has a larger difference between the neighboring ones Intervals between two zero crossings.
  • Short-circuit currents that do not go through zero which have caused problems with large capacitor systems, can be switched off in an extremely economical manner.
  • the phase that must first be switched off can be easily detected by the following method.
  • the first zero crossing of the secondary current of the current transformer 2, which is provided in each of the three phases of the main circuit 1, is detected, for example, by a zero crossing detection device 3, which responds when the value 0 is passed. Furthermore, a first integrator 4 is excited by this signal in order to charge the capacitor in this integrator. As a result, the first integrator 4 is stopped when one of the two integrators 5 is started simultaneously with the pulse of the second zero crossing, which is emitted by the zero crossing detection device 3. Furthermore, the second integrator is stopped when the first integrator is excited again by the third zero crossing pulse. This way of working continues.
  • the difference between the adjacent distances, which are defined by the zero crossings in the corresponding phase, is formed by introducing the stored voltages into a subtractor 6, and the difference of each phase thus obtained is fed to a comparator 8 via an absolute value generator 7 for comparison here to be so that the phase which has the greatest distance between the zero points and is to be switched off first can be determined. Since the non-zero current causes the zero crossing detector 3 not to output an output, the input to the comparator 8 is also zero and this phase is compared to the others assuming that their difference between the zero points is zero. Accordingly, this phase is not recognized as the phase that must first be switched off.
  • the following describes a method of how to control the shutdown operation for the current to be shutdown after determining the phase to be shutdown first.
  • Fig. 7 shows a block diagram of such a control method with current transformers 2 in each phase of the main circuit 1 as an input element for detecting the phase to be switched off described in more detail above.
  • the current transformers 2 are connected to a phase selection device 9 for determining the phase to be switched off first, into which the secondary current of the current transformer is introduced as an input.
  • the phase selection device consists of parts 3 to 8 as described in FIG. 6.
  • the output of a protection relay 10 as an output for a switch-off command using the short-circuit current of the main line 1 is led to a logic multiplier 11, which will be described later.
  • phase S is certainly the first to be interrupted at time N, in that a switch-off command is given to the switch in such a way that phase S, which is to switch off first, at time G - see FIG. 8 - was measured (the time axis according to FIG. 1 is extended).
  • the minimum arc time is in the following small loop, i.e. on the peak value between times M and N.
  • the position determined by the switch-off command can only be used by using the waveform of the AC component, regardless of the size the DC component.
  • the minimum arc extinguishing time must be positioned so that it remains at the peak between times M and N when the position P of the first peak has been detected after the current with phase S has been detected, as shown in FIG. 8 , for example by using a differentiation circuit to provide the switch-off command at a point that is shifted by a certain expiration time compared to the above position.
  • No. 12 in FIG. 7 shows a phase selection device which permits a current flow of the secondary current in one of the current transformers 17 which are arranged in the phases of the main circuit 1 in the phase which is to be switched off first, and instructions which of the phases are selected should be given by the phase selection device 9.
  • the result of the logical multiplication of the signal which represents the peak value of the phase which is to be switched off first, with a command for three-phase switch-off from the protective relay 10, is output by the logic multiplication circuit 11 and the current which is to be switched off first is switched off, when the output signal has been delayed by the device 14 for a predeterminable time and has reached the trip coil of the switch.
  • the switch In the event that the switch is operated together with respect to the three phases by a common drive, the currents in the following two phases will go out at zero crossing.
  • the switch is constructed such that actuators are provided in each of the phases and each of the phases can be switched off independently of the others, the three-phase current can be switched off by inserting the output of the delay device 14 into a delay device 15 to produce a time delay, to produce a delay time of approximately half a period, after which the other two phases are switched off later than the first by this time delay.
  • An auxiliary contact in the first disconnected phase is opened at the same time as it is switched off and the current for the trip coil, which is in series with the contact, is also switched off. Accordingly, no switch-off command is given to the tripping coil of the first phase if the switch-off command for the other phases is issued by the delay device 15 with a Time delay is supplied to the switch is released.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Emergency Protection Circuit Devices (AREA)
  • Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
  • Keying Circuit Devices (AREA)
  • Control Of Multiple Motors (AREA)

Claims (3)

1. Dispositif pour interrompre des courants, notamment des courants de court-circuit, dans des réseaux triphasés (R, S, T), dans lesquels le courant d'une phase (T) ne s'annule pas initialement, à l'aide d'interrupteurs prévus séparément pour les phases et commandés par un dispositif (3-8) de détection du courant comportant des dispositifs (3) de détection d'annulations du courant, caractérisé par le fait que le dispositif (3-8) de détection du courant détermine celle (S) des deux phases (R, S) s'annulant, pour laquelle la différence des intervalles de temps voisins (C-D, D-G), qui sont définis par trois annulations successives (C, D, G), est plus élevée que dans l'autre phase (R) et déconnecte tout d'abord la phase (S), dans laquelle la différence est supérieure.
2. Dispositif selon la revendication 1, caractérisé en ce que les deux phases (R, T) devant être déconnectées en dernier lieu, sont débranchées avec un retard.
3. Dispositif suivant la revendication 1, caractérisé par le fait que le dispositif (3-8) de détection du courant est constitué par des dispositifs (3) de détection d'annulations, associés à chaque phase (R, T) et en aval desquels sont branchés des intégrateurs (4, 5) pouvant être excités et bloqués en alternance lors de l'annulation et dont les sorties sont raccordées à un étage soustracteur (6) dont les sorties sont raccordées, par l'intermédiaire d'un dispositif (7) de formation de valeurs absolues, à un comparateur (8) commun à toutes les phases (R, S, T).
EP84112088A 1983-10-11 1984-10-09 Dispositif pour l'interruption de courants Expired EP0142022B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT84112088T ATE26773T1 (de) 1983-10-11 1984-10-09 Anordnung zum abschalten von stroemen.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP189658/83 1983-10-11
JP58189658A JPS6082016A (ja) 1983-10-11 1983-10-11 三相短絡電流の遮断方法

Publications (2)

Publication Number Publication Date
EP0142022A1 EP0142022A1 (fr) 1985-05-22
EP0142022B1 true EP0142022B1 (fr) 1987-04-22

Family

ID=16244999

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84112088A Expired EP0142022B1 (fr) 1983-10-11 1984-10-09 Dispositif pour l'interruption de courants

Country Status (4)

Country Link
EP (1) EP0142022B1 (fr)
JP (1) JPS6082016A (fr)
AT (1) ATE26773T1 (fr)
DE (1) DE3463321D1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2660842B2 (ja) * 1988-02-23 1997-10-08 株式会社明電舎 真空開閉装置の過電圧防止装置
JP5159075B2 (ja) * 2006-09-25 2013-03-06 株式会社東芝 遮断器の開閉制御装置

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1563656A1 (de) * 1966-01-26 1970-02-19 Siemens Ag Leistungsschalterschutz
SE338092B (fr) * 1968-03-15 1971-08-30 Asea Ab
JPS57101514A (en) * 1980-12-15 1982-06-24 Tokyo Shibaura Electric Co Defect current breaking system

Also Published As

Publication number Publication date
JPH053206B2 (fr) 1993-01-14
ATE26773T1 (de) 1987-05-15
JPS6082016A (ja) 1985-05-10
DE3463321D1 (en) 1987-05-27
EP0142022A1 (fr) 1985-05-22

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