EP1480241A1 - Verfahren zur Abschaltung von Gleichströmen und Gleichstrom-Schnellschalteinrichtung für Bahnstromversorgungen - Google Patents
Verfahren zur Abschaltung von Gleichströmen und Gleichstrom-Schnellschalteinrichtung für Bahnstromversorgungen Download PDFInfo
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- EP1480241A1 EP1480241A1 EP03090155A EP03090155A EP1480241A1 EP 1480241 A1 EP1480241 A1 EP 1480241A1 EP 03090155 A EP03090155 A EP 03090155A EP 03090155 A EP03090155 A EP 03090155A EP 1480241 A1 EP1480241 A1 EP 1480241A1
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- Prior art keywords
- current
- quenching
- time
- switching
- switching device
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- 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
- H01H33/02—Details
- H01H33/59—Circuit arrangements not adapted to a particular application of the switch and not otherwise provided for, e.g. for ensuring operation of the switch at a predetermined point in the ac cycle
- H01H33/596—Circuit arrangements not adapted to a particular application of the switch and not otherwise provided for, e.g. for ensuring operation of the switch at a predetermined point in the ac cycle for interrupting dc
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- 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
- H01H9/541—Contacts shunted by semiconductor devices
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- 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
Definitions
- the invention relates to a method and a device for switching off a direct current in a rectifier substation for a direct current traction power supply using a vacuum switch and one Off circuit.
- DE 44 47 439 describes a method and a circuit arrangement for a commutation and quenching device of a quick breaker in which firing pulses for two switching thyristors in the commutation branch are triggered at the same time as the switching command for the quick breaker, as a result of which the capacitor is discharged via the drive coils of the quick breaker and causes the contact opening. At the same time, the current commutates into the commutation branch. At a later point in time, two charging thyristors are fired, as a result of which the capacitor is recharged and the full capacitor voltage clears the two switching thyristors in the commutation branch.
- the task is a method and a DC high-speed switching device for traction power supplies that specify a reliable and fast shutdown of the operating current or of Short circuit currents with simultaneous electrical isolation of the line from ensure the busbar of the rectifier substation and with inexpensive components can be realized.
- this object is achieved by a method and a DC high-speed switching device with the features of Claims 1 and 9 solved.
- the shutdown process by opening the metallic contact of a switching device that preferably a vacuum switch is initiated. It forms in the Vacuum interrupter an arc over the switching path.
- a parallel Extinguishing capacitor arranged to the switching path becomes a guarantee the operational readiness of the quick-switching device between the Discharges constantly charged.
- a quenching thyristor ignited, causing the quenching capacitor over the Switching section of the switching device discharges.
- the defined time too which the quenching thyristor is ignited, taking into account the mechanical switching times of the switching device and depending on the switching current selected so that this "zero value" of the resulting Switch current occurs at a time when the Dielectric strength of the switching path in the switching device is guaranteed. So that the system load is kept as low as possible, the "Zero value" of the resulting current but as early as possible Point in time, i.e. immediately or as early as possible after the Switching distance that has achieved dielectric strength.
- the quenching capacitor is charged before each discharge process so that when the first quenching thyristor is fired, the quenching current of the quenching capacitor on the first swing against the preferred direction of the Operating current flows over the switching path, so that when switching Forward flow a "zero value" of the resulting switch current occurs across the switching path.
- the ignition pulse for the second Quenching thyristor given.
- the second reloading process of the Quenching capacitor, now with reverse current direction, initiated, if not the operating current to be switched at this time is switched off.
- the DC high-speed switching device for traction power supplies characterized by the features of claim 9, wherein between the line and the busbar of the rectifier substation Switching device is arranged.
- an extinguishing circuit arranged, which consists of a Löschkondenstor, with two anti-parallel arranged quenching thyristors and an inductor is connected in series.
- a test branch is also arranged in parallel with the switching device.
- the Test branch consists of a series connection of one test thyristor, one Current measuring element and a test resistor.
- the DC high-speed switching device also has a freewheeling circuit for each Current direction each has a branch, from the busbar to Return line or from the route to the return line, in each of which two Free-wheeling diodes, which are connected in series, are arranged.
- One each Freewheeling diode in each branch of the freewheeling circuit is a fuse in parallel arranged with message.
- the dimensioning of the freewheeling diode and the Fuse is chosen so that only a small part of the Freewheeling current flows through the respective fuse, while the largest part of the freewheeling current over the one arranged in parallel for securing Free-wheeling diode flows.
- the rapid switching device has the advantage that it can be implemented with inexpensive components, in particular thyristors and capacitors, since there are no high demands on the switching speed and the dynamic properties. Another advantage is that with this quick-switching device, the galvanic isolating path is not bridged by semiconductor components that could take over an unintentional current flow due to lightning overvoltages. Thus, this arrangement always ensures the plant safety. Since an arc is formed between the switching contacts of the switching device at the start of the switch-off process, the switching stability of the vacuum interrupter is continuously regenerated.
- FIG. 1 shows the basic circuit arrangement for the rapid switching device, a vacuum switch VS being used as the switching device.
- the rapid switching device is connected via a two-pole switch SBT on the one hand to the busbar SS of the traction power supply and on the other hand to the section ST .
- SBT two-pole switch
- the vacuum switch VS is arranged between the busbar SS of the traction power supply and the section ST and serves on the one hand to guide operating currents, load or short-circuit currents in both current directions and on the other hand for the rapid production of a galvanic isolating section.
- the vacuum switch VS is driven by means of an electromagnetic drive.
- a current detection element T is arranged in the current path of the vacuum switch and detects the operating and fault currents.
- an extinguishing circuit is arranged between the busbar SS of the traction power supply and the line ST .
- This quenching circuit consists of a quenching capacitor LK, two quenching thyristors LT1 , LT2 arranged in series with it in antiparallel and an inductor L connected in series.
- a test circuit is also arranged in parallel to the vacuum switch VS , which checks the current status of the line before it is switched on again.
- the test circuit consists of a series connection of a test thyristor Vp , a current measuring element Tp and a test resistor PW . To test the route, the test thyristor Vp is ignited and the current flowing through the test resistor PW is detected with the current measuring element Tp .
- the high-speed switching device is completed by a freewheeling circuit FK, which has two branches, one of which is arranged between the busbar SS of the traction power supply and the return conductor RL and the other between the path ST and the return conductor RL .
- the freewheeling circuit FK ensures that, after the galvanic isolating section has been produced in the vacuum switch VS, the energy present in the inductances of the section is rapidly dissipated by freewheeling currents I F.
- This free-wheeling circuit FK is constructed in such a way that two free-wheeling diodes FD1, FD2 and FD3 , FD4 , FD4 , respectively , are arranged in series for each branch, from the busbar SS to the return conductor RL or from the path ST to the return conductor RL .
- a fuse Si1, Si2 with a message is arranged in parallel with the respective freewheeling diode FD1, FD4 connected to the busbar SS or to the section ST .
- the fuse Si1, Si2 is dimensioned such that the voltage drop across the parallel freewheeling diode FD1, FD4 does not exceed the voltage drop of the fuse at twice the nominal current , even with a maximum freewheeling current I F. This ensures that normally only approx. 0.1% to 1% of the freewheeling current I F flows through the respective fuse Si1 or Si2 . Most of the freewheeling current I F always flows through the freewheeling diode FD1 or FD4.
- the control module SG processes the measured values and outputs the corresponding control commands to the vacuum switch VS and the quenching thyristors LT1 , LT2 .
- the opening process of the vacuum switch VS is initiated automatically in accordance with the set limit values.
- the dimensioning of the quenching circuit in particular the capacitance of the quenching capacitor LK and the inductance L , the quenching thyristors LT1 , LT2 are controlled in a time-optimized manner.
- the control module SG also carries out the route test, in which the route resistance is calculated taking into account the current outgoing voltage.
- a first example is selected in FIG. 2 in which an occurring short-circuit current I K is to be switched off in the preferred direction, ie a short-circuit on the line ST is fed by the traction current supply via the busbar SS .
- the rising short-circuit current I K is detected by the current detection element T in the current path of the vacuum switch VS.
- an adjustable operating current of, for example, 4 kA is reached, the switch-off command for the vacuum switch VS is given at time t 1 and the drive begins to open the contacts of the vacuum switch VS after approximately 0.3 ms at time t 2 .
- the contact opening runs evenly over the contact path KW , the maximum contact distance is 2 mm.
- the short-circuit current I K continues to flow via the switching arc that forms within the vacuum chamber when the contact is lifted.
- the flowing current must assume the value "zero" because the vacuum switch used is not able to switch off a flowing short-circuit current.
- the control command for firing the quenching thyristor LT1 is given at time t 3 .
- the energy stored in the quenching capacitor LK is released; an quenching current I L flows from the quenching capacitor LK via the switching path of the vacuum switch VS against the current direction of the short-circuit current I K.
- the quenching current I L is in the form of an oscillating alternating current. Due to the selected scale, the entire course of the quenching current I L is not shown in FIG. 2, but only the section that is relevant for the quenching of the arc.
- the two currents, the short-circuit current I K and the quenching current I L overlap in the current path of the vacuum switch VS and thus over the switching path to the resulting switch current I S.
- the two currents, the short-circuit current I K and the quenching current I L each have such a value that the resulting switch current I S reaches the value "zero".
- the switching arc between the contacts of the vacuum switch VS also goes out.
- the current voltage of the quenching capacitor LK is present across the switching path. If this voltage does not exceed the dielectric strength of the switching path existing at this point in time t 4 , the arc does not ignite again and the short-circuit current I K is switched off. If, on the other hand, the dielectric strength of the switching path of the vacuum switch VS is not yet given at this time t 4 , as in the selected example (the contact distance is approx. 0.2 mm), the arc is re-ignited and the short-circuit current I K continues to flow via the switching path.
- the quenching current I L from the quenching capacitor LK also continues to flow over the switching path of the vacuum switch VS against the current direction of the short-circuit current I K. Since the quenching current I L corresponds to a sine half-wave, the resulting switch current I S has the value "zero" for the second time at time t 5 . At this point, the arc extinguishes over the switching path of the vacuum switch VS (the contact distance is now approx. 1 mm), since the required dielectric strength now exists, no arc can be ignited again. The short-circuit current I K is thus finally switched off. The energy still present in the route network is dissipated by a flowing freewheeling current I F via the corresponding branch of the freewheeling circuit FK, the freewheeling diodes FD3, FD4 in the direction of the return conductor RL .
- the quenching current I L and thus also the resulting switch current I S can also be determined for each short-circuit current I K to be switched as a function of the ignition point t 3 of the quenching capacitor LK .
- the defined time t 3 for firing the quenching thyristor LT1 is selected such that the maximum of the oscillating quenching current I L is in any case greater than the short-circuit current I K flowing at this time . This ensures that the resulting switch current I S has the value "zero" twice.
- the switching path has the required dielectric strength. Since the two "zero values" of the switch current I S at t 4 and t 5 are at a maximum interval of 0.6 ms, the load on the system by switching off the short-circuit current I K can only be justified at the second "zero value".
- a small operating current I B is to be switched off.
- the capacitor voltage would also be present across the isolating path. A voltage corresponding to the addition of the busbar voltage and capacitor voltage would thus be present across the isolating section until the quenching capacitor LK is reloaded via the section ST .
- the firing pulse for firing the quenching thyristor LT1 is given at the time t 3 before the time t 2 , the start of the contact opening, so that no galvanic isolation path can occur in the vacuum switch VS A defined charge reversal of the quenching capacitor LK thus takes place via the still closed contact path or the arcing which forms between the contacts of the vacuum switch VS and the overvoltage is avoided.
- the switch-off command for the vacuum switch VS is given at time t 1 and the drive begins to open the contacts of the vacuum switch VS at time t 2 , the quenching current I L already flowing from the quenching capacitor LK .
- the quenching current I L flows from the quenching capacitor LK also in the opposite direction to the operating current I B through the switching path of the vacuum switch VS. Since in this case the first "zero value" is reached at time t 4 , which is before time t 2 , ie the contact opening has not yet started, the switching path is still conductive. It follows that the arc only at time t 5 , the dielectric strength of the switching path is now also guaranteed, extinguishes when the second "zero value" of the switch current I S is reached and the operating current I B is switched off. Now the freewheeling current I F begins to flow.
- a reverse current I R which flows from the section ST to the busbar SS , is to be switched off. Since in this case a current is to be switched off which flows counter to the “preferred direction”, the quenching thyristor LT1 is also fired at another time in this case as well, as a result of which a “zero value” of the switch current I S occurs as early as possible after it has existed the dielectric strength of the switching path is reached. In this case, the ignition pulse at time t 3 for the quenching thyristor LT1 is given immediately after time t 1 , the switch-off command for the vacuum switch VS.
- a defined reloading of the quenching capacitor LK thus takes place via the closed contact of the vacuum switch VS.
- the quenching current I L of the quenching capacitor LK and the return current I R have the same current direction in the vacuum switch VS for the period between the times t 3 and t 7 , the duration of the first reversing process, and add up.
- the ignition pulse for the second quenching thyristor LT2 is given, whereby the second recharging process of the quenching capacitor LK is initiated at time t 7 .
- the quenching current I L and the reverse current I R have different current directions, as a result of which the switch current I S reaches the value "zero" at the instant t 4 .
- the switching path of the vacuum switch VS has the required dielectric strength, so that the arc between the contacts of the vacuum switch VS is extinguished and the reverse current is switched off.
- the freewheeling current I F begins to flow.
- the three examples described above correspond to typical / critical operating currents which are to be switched off by the DC high-speed switching device.
- the times t 1 to t 7 can be predefined in the control module SG .
- the quenching thyristors LT1 , LT2 are repeatedly fired, so that the discharge of the quenching capacitor LK is repeated analogously to the previously described method steps. Since the breakdown resistance is guaranteed at the latest when a third "zero value" of the switch current I S is reached, an arc is not re-ignited over the switching path and the operating current to be switched is also switched off at this point in time at the latest.
- the freewheeling circuit FK ensures that after the production of the galvanic isolating section, the energy present in the inductances of the ST section is dissipated by the flowing freewheeling currents I F in one direction or the other.
- This freewheeling circuit FK is constructed in such a way that it has a branch for each current direction, from the busbar SS to the return conductor RL or from the path ST to the return conductor RL .
- Two free-wheeling diodes FD1, FD2 and FD3, FD4 are connected in series in each branch.
- the failure of the free-wheeling diode FD2 or FD3 results in a short-circuit current via the fuse Si1 or Si2, as a result of which it responds and switches off this short-circuit current.
- the freewheeling circuit FK is because of the functional residual freewheeling diodes FD1, FD4 voltage resistant again.
- the respective fuse Si1, Si2 reports this state to the control module SG. This means that the FK freewheel circuit always remains functional.
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- Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
Abstract
Description
Der Nachteil dieser Einrichtung besteht insbesondere darin, dass eine Vielzahl von schnellen und hochbelastbaren Bauelementen, insbesondere Thyristoren erforderlich ist, wodurch diese Einrichtung sehr teuer ist.
Ein weiterer Nachteil besteht darin, dass bei diesen Einrichtungen zu einer von den Anwendern geforderten galvanischen Trennung der Strecke von der Sammelschiene eine zusätzliche Trennstelle vorgesehen werden musste.
Ein weiterer Vorteil besteht darin, dass mit dieser Schnellschalteinrichtung die galvanische Trennstrecke nicht durch Halbleiterbauelemente überbrückt wird, die infolge von Blitzüberspannungen eine unbeabsichtigte Stromführung übernehmen könnten. Somit gewährleistet diese Anordnung stets die An lagensicherheit.
Da bei Beginn des Abschaltvorgangs zwischen den Schaltkontakten des Schaltgerätes ein Lichtbogen ausgebildet wird, wird ständig die Schaltfestigkeit der Vakuumschaltkammer regeneriert.
- Fig. 1:
- Prinzipschaltung der Schnellschalteinrichtung
- Fig. 2:
- Stromverläufe und Zeitpunkte für Öffnung des Schaltgerätes und Zündung des Löschthyristors für große Ströme
- Fig. 3:
- Stromverläufe und Zeitpunkte für Öffnung des Schaltgerätes und Zündung des Löschthyristors für kleine Ströme
- Fig. 4:
- Stromverläufe und Zeitpunkte für Öffnung des Schaltgerätes und Zündung des Löschthyristors für Rückströme
Die Sicherungsüberwachung der Sicherungen Si1, Si2 des Freilaufkreises FK erfolgt auch durch die Steuerbaugruppe SG, die auch weitere sicherheitsrelevante Größen, wie beispielsweise die Ladespannung des Löschkondensators LK überwacht.
In diesem Fall wird der Zündimpuls im Zeitpunkt t3 für den Löschthyristor LT1 sofort nach dem Zeitpunkt t1, dem Ausschaltbefehl für den Vakuumschalter VS gegeben. Damit erfolgt ein definiertes Umladen des Löschkondensators LK über den geschlossenen Kontakt des Vakuumschalters VS. Der Löschstrom IL des Löschkondensators LK und der Rückstrom IR haben im Vakuumschalter VS für den Zeitraum zwischen den Zeitpunkten t3 und t7, der Zeitdauer des ersten Umschwingvorganges, die gleiche Stromrichtung und addieren sich. Dadurch ergibt sich beim ersten Stromanstieg des Löschstromes IL kein "Nullwert" des resultierenden Schalterstromes Is.
Zum Zeitpunkt t6 wird der Zündimpuls für den zweiten Löschthyristor LT2 gegeben, wodurch zum Zeitpunkt t7 der zweite Umladevorgang des Löschkondensators LK eingeleitet wird. Nun weisen die beiden Ströme, der Löschstrom IL und der Rückstrom IR unterschiedliche Stromrichtungen auf, wodurch der Schalterstrom IS zum Zeitpunkt t4 den Wert "Null" erreicht. Zu diesem Zeitpunkt weist die Schaltstrecke des Vakuumschalters VS die erforderliche Durchschlagsfestigkeit auf, so dass der zwischen den Kontakten des Vakuumschalters VS stehende Lichtbogen gelöscht wird und der Rückstrom ist abgeschaltet. Der Freilaufstrom IF beginnt zu fließen.
Claims (10)
- Verfahren zur Abschaltung von Gleichströmen in einem Gleichrichter-Unterwerk für Bahnstromversorgungen mit einer Gleichstrom-Schnellschalteinrichtung unter Verwendung eines Schaltgerätes und eines parallel zur Schaltstrecke des Schaltgerätes angeordneten Löschkreises, bestehend aus einem Löschkondensator, der mit zwei antiparallel geschalteten Löschthyristoren und einer Induktivität in Reihe geschaltet ist,
dadurch gekennzeichnet, dass
der Abschaltvorgang durch einen Schaltbefehl zum Öffnen des metallischen Kontakts des Schaltgerätes (VS) zum Zeitpunkt (t1) eingeleitet wird und zu einem definierten Zeitpunkt (t3), der von Betrag und Richtung des zu schaltenden Betriebsstromes (IB) abhängt, der erste Löschthyristor (LT1) und in Abhängigkeit vom zeitlichen Verlauf des Löschstromes (IL) des Löschkondensators (LK) zeitlich verzögert, zum Zeitpunkt (t6), der zweite Löschthyristor (LT2) gezündet wird, wodurch sich der Löschkondensator (LK) über die Schaltstrecke des Schaltgerätes (VS) entlädt, wobei durch die Überlagerung des Betriebsstromes (IB), von der Sammelschiene (SS) und des Löschstromes (IL) vom Löschkondensator (LK) zum resultierenden Schalterstrom (IS) über der Schaltstrecke, bei einer entsprechenden Dimensionierung des Löschkreises, mindestens einmal der Schalterstrom (IS) den Wert "Null" annimmt und der definierte Zeitpunkt (t3) zum Zünden des Löschthyristors (LT1) so gewählt wird, dass ein "Nullwert" des Schalterstromes (IS) zu einem Zeitpunkt (t4, t5) erreicht wird, bei welchem die Durchschlagsfestigkeit der Schaltstrecke im Schaltgerät (VS) gewährleistet ist. - Verfahren nach Anspruch 1,
dadurch gekennzeichnet, dass
der Löschkondensator (LK) stets so vorgeladen ist, dass mit Zünden des ersten Löschthyristors (LT1) der Löschstrom (IL) des Löschkondensator (LK) beim ersten Umschwingen entgegen der Vorzugsrichtung des Betriebsstromes (IB) fließt. - Verfahren nach Anspruch 1 und 2,
dadurch gekennzeichnet, dass
zur Abschaltung eines in der Vorzugsrichtung fließenden großen Betriebsstromes (IB), insbesondere eines Kurzschlussstromes (IK), bei Erreichen eines einstellbaren Grenzwertes zum Zeitpunkt (t1) der Ausschaltbefehl für das Schaltgerät (VS) gegeben wird, danach zum Zeitpunkt (t3) der Steuerbefehl zum Zünden des Löschthyristors (LT1) gegeben wird, wodurch der Löschstrom (IL) über die Schaltstrecke des Schaltgerätes (VS) entgegen der Stromrichtung des Kurzschlussstromes (IK) fließt und der Schalterstrom (IS) zu den Zeitpunkten (t4, t5) jeweils den Wert "Null" erreicht, und bei Bestehen der Durchschlagsfestigkeit der Schaltstrecke zu einem der beiden Zeitpunkte (t4, t5) der Betriebsstrom (IB) bzw. der Kurzschlussstrom (IK) zu diesem Zeitpunkt abgeschaltet ist. - Verfahren nach Anspruch 1 und 2,
dadurch gekennzeichnet, dass
zur Abschaltung eines kleinen in der Vorzugsrichtung fließenden Betriebsstromes (IB) zum Zeitpunkt t1 der Ausschaltbefehl für das Schaltgerät VS gegeben und der Zündimpuls zum Zünden des Löschthyristors LT1 im Zeitpunkt t3 , vor dem Zeitpunkt t2 , dem Beginn der Kontaktöffnung, gegeben wird, so dass eine definierte Umladung des Löschkondensators LK über die noch geschlossene Kontaktstrecke bzw. den sich ausbildenden Lichtbogen zwischen den Kontakten des Schaltgerätes VS erfolgt, wobei der Löschstrom IL vom Löschkondensator LK entgegengesetzt der Richtung des Betriebsstromes IB über die Schaltstrecke des Schaltgerätes (VS) fließt und der Betriebsstrom (I B) zum Zeitpunkt t4 zum ersten mal den Wert "Null" erreicht zu dem die Schaltstrecke noch leitend ist und der Betriebsstrom (IB) zum Zeitpunkt t5 zum zweiten mal den Wert "Null" erreicht und da jetzt die Durchschlagsfestigkeit der Schaltstrecke gewährleistet ist, der Betriebsstrom IB abgeschaltet ist. - Verfahren nach Anspruch 1 und 2,
dadurch gekennzeichnet, dass
zur Abschaltung eines entgegen der Vorzugsrichtung fließenden Rückstromes (IR) der Zündimpuls im Zeitpunkt (t3) für den Löschthyristor (LT1) sofort nach dem Zeitpunkt (t1), zu dem der Ausschaltbefehl für das Schaltgerät (VS) gegeben wird, wodurch ein definiertes Umladen des Löschkondensators (LK) über den noch geschlossenen Kontakt des Schaltgerät (VS) erfolgt und sich der Löschstrom (IL) und der Rückstrom (IR), da sie die gleiche Stromrichtung haben im Betrag addieren und zum Zeitpunkt (t6) der Zündimpuls für den zweiten Löschthyristor (LT2) gegeben wird, wodurch der zweite Umladevorgang des Löschkondensators (LK) mit umgekehrter Stromrichtung eingeleitet wird und nun der Löschstrom (IL) entgegen der Stromrichtung des Rückstromes (IR) über die Schaltstrecke des Schaltgerätes (VS) fließt und somit der Schalterstrom (IS) zum Zeitpunkt (t4) den Wert "Null" aufweist, zu dem die Schaltstrecke des Schaltgerätes (VS) die erforderliche Durchschlagsfestigkeit aufweist, so dass der Rückstrom (IR) abgeschaltet ist. - Verfahren nach Anspruch 1,
dadurch gekennzeichnet, dass
in jedem Fall zum Zeitpunkt (t6), der durch den zeitlichen Verlauf des Umschwingvorganges des Löschstromes (IL) bestimmt ist, der Zündimpuls für den zweiten Löschthyristor (LT2) gegeben wird, wodurch der zweite Umladevorgang des Löschkondensators (LK) mit umgekehrter Stromrichtung eingeleitet wird, sodass nun der Löschstrom (IL) in der Vorzugsrichtung des Betriebsstromes (IB) über die Schaltstrecke des Schaltgerätes (VS) fließt, sofern zu diesem Zeitpunkt nicht bereits der zu schaltende Betriebsstrom (IB) abgeschaltet ist. - Verfahren nach Anspruch 1,
dadurch gekennzeichnet, dass
bei Erreichen eingestellter Grenzwerte des Betriebsstromes (IB) durch das Steuergerät (SG) der Abschaltvorgang selbsttätig ausgelöst wird. - Verfahren nach Anspruch 1,
dadurch gekennzeichnet, dass
zum Abschalten eines Betriebsstromes (IB) unter extremen Bedingungen die Löschthyristoren (LT1, LT2) abwechselnd wiederholt gezündet werden, so dass sich der Löschkondensator (LK) mehrfach hintereinander über die Schaltstrecke des Schaltgerätes (VS) entlädt, bis bei Erreichen eines "Nullwertes" des Schalterstromes (IS) die erforderliche Durchschlagsfestigkeit der Schaltstrecke gewährleistet ist und der Betriebsstrom (IB) endgültig abgeschaltet ist. - Schnellschalteinrichtung zur Löschung eines Gleichstromes in einem Gleichrichter-Unterwerk für eine Gleichstrom-Bahnstromversorgung unter Verwendung eines Schnellunterbrechers und eines Löschkreises,
dadurch gekennzeichnet, dass
zwischen der Strecke (ST) und der Sammelschiene (SS) des Gleichrichter-Unterwerks ein Schaltgerät (VS), das mit einem Stromerfassungsglied (T) in Reihe geschaltet ist, angeordnet ist, zu dem parallel ein Löschkreis, bestehend aus einem Löschkondenstor (LK) zu dem zwei antiparallel angeordnete Löschthyristoren (LT1, LT2) und eine Induktivität (L) in Reihe geschaltet sind, angeordnet ist und zu dem Schaltgerät (VS) ebenfalls parallel ein Prüfzweig angeordnet ist, der aus einer Reihenschaltung von einem Prüfthyristor (Vp), einem Strommessglied (Tp) und einem Prüfwiderstand (PW) besteht und weiterhin ein Freilaufkreis bestehend aus zwei Zweigen, von denen einer zwischen der Sammelschiene SS und dem Rückleiter RL und der andere zwischen der Strecke ST und dem Rückleiter RL angeordnet ist, die jeweils zwei in Reihe geschaltete Freilaufdioden FD1, FD2 bzw. FD3, FD4 aufweisen und parallel zur jeweiligen mit der Sammelschiene SS bzw. mit der Strecke ST verbundenen Freilaufdiode FD1, FD4, jeweils eine Sicherung Si1, Si2 mit Meldung angeordnet ist. - Schnellschalteinrichtung nach Anspruch 9,
dadurch gekennzeichnet, dass
die Dimensionierung der Freilaufdiode (FD1, FD4) und der dazu parallel angeordneten Sicherung (Si1, Si2) dabei so gewählt ist, dass jeweils nur ein geringer Teil des Freilaufstromes (IF) über die jeweilige Sicherung (Si1, Si2) fließt, während der größte Teil des Freilaufstromes (IF) über die zu dieser Sicherung (Si1, Si2) parallel angeordnete Freilaufdiode (FD1, FD4) fließt.
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
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DE50302112T DE50302112D1 (de) | 2003-05-23 | 2003-05-23 | Verfahren zur Abschaltung von Gleichströmen und Gleichstrom-Schnellschalteinrichtung für Bahnstromversorgungen |
EP03090155A EP1480241B1 (de) | 2003-05-23 | 2003-05-23 | Verfahren zur Abschaltung von Gleichströmen und Gleichstrom-Schnellschalteinrichtung für Bahnstromversorgungen |
AT03090155T ATE315274T1 (de) | 2003-05-23 | 2003-05-23 | Verfahren zur abschaltung von gleichströmen und gleichstrom-schnellschalteinrichtung für bahnstromversorgungen |
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EP03090155A EP1480241B1 (de) | 2003-05-23 | 2003-05-23 | Verfahren zur Abschaltung von Gleichströmen und Gleichstrom-Schnellschalteinrichtung für Bahnstromversorgungen |
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EP1480241A1 true EP1480241A1 (de) | 2004-11-24 |
EP1480241B1 EP1480241B1 (de) | 2006-01-04 |
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EP (1) | EP1480241B1 (de) |
AT (1) | ATE315274T1 (de) |
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Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
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WO2013037589A1 (de) * | 2011-09-13 | 2013-03-21 | Siemens Aktiengesellschaft | Gleichspannungs-leitungsschutzschalter |
DE102012008614A1 (de) | 2012-04-27 | 2013-10-31 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Elektrischer Steckverbinder zum sicheren Trennen von elektrischen Strömen unter elektrischer Gleichspannung in Stromnetzen mit bidirektionalem Stromfluss |
US9054530B2 (en) | 2013-04-25 | 2015-06-09 | General Atomics | Pulsed interrupter and method of operation |
US20160329179A1 (en) * | 2013-12-30 | 2016-11-10 | Hyosung Corporation | High-voltage dc circuit breaker |
Families Citing this family (2)
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US8174801B2 (en) | 2009-04-01 | 2012-05-08 | Honeywell International, Inc. | Controlling arc energy in a hybrid high voltage DC contactor |
US9742185B2 (en) | 2015-04-28 | 2017-08-22 | General Electric Company | DC circuit breaker and method of use |
-
2003
- 2003-05-23 DE DE50302112T patent/DE50302112D1/de not_active Expired - Lifetime
- 2003-05-23 AT AT03090155T patent/ATE315274T1/de active
- 2003-05-23 EP EP03090155A patent/EP1480241B1/de not_active Expired - Lifetime
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Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2013037589A1 (de) * | 2011-09-13 | 2013-03-21 | Siemens Aktiengesellschaft | Gleichspannungs-leitungsschutzschalter |
US9178348B2 (en) | 2011-09-13 | 2015-11-03 | Siemens Aktiengesellschaft | DC voltage line circuit breaker |
DE102012008614A1 (de) | 2012-04-27 | 2013-10-31 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Elektrischer Steckverbinder zum sicheren Trennen von elektrischen Strömen unter elektrischer Gleichspannung in Stromnetzen mit bidirektionalem Stromfluss |
US9054530B2 (en) | 2013-04-25 | 2015-06-09 | General Atomics | Pulsed interrupter and method of operation |
US20160329179A1 (en) * | 2013-12-30 | 2016-11-10 | Hyosung Corporation | High-voltage dc circuit breaker |
EP3091626A4 (de) * | 2013-12-30 | 2017-08-23 | Hyosung Corporation | Hochspannungs-gleichstromschutzschalter |
US10176947B2 (en) * | 2013-12-30 | 2019-01-08 | Hyosung Heavy Industries Corporation | High-voltage DC circuit breaker for blocking DC current |
Also Published As
Publication number | Publication date |
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EP1480241B1 (de) | 2006-01-04 |
DE50302112D1 (de) | 2006-03-30 |
ATE315274T1 (de) | 2006-02-15 |
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