DE652967C - Circuit for the protection of converter systems in which inductive alternating current consumers, which are repeatedly switched on and off, preferably welding transformers, are fed via controllable discharge paths connected in parallel in opposite directions, in particular those with gas or steam filling - Google Patents
Circuit for the protection of converter systems in which inductive alternating current consumers, which are repeatedly switched on and off, preferably welding transformers, are fed via controllable discharge paths connected in parallel in opposite directions, in particular those with gas or steam fillingInfo
- Publication number
- DE652967C DE652967C DES120555D DES0120555D DE652967C DE 652967 C DE652967 C DE 652967C DE S120555 D DES120555 D DE S120555D DE S0120555 D DES0120555 D DE S0120555D DE 652967 C DE652967 C DE 652967C
- Authority
- DE
- Germany
- Prior art keywords
- circuit
- direct current
- opposite directions
- parallel
- protection
- 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
Links
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/02—Circuits specially adapted for the generation of grid-control or igniter-control voltages for discharge tubes incorporated in static converters
- H02M1/04—Circuits specially adapted for the generation of grid-control or igniter-control voltages for discharge tubes incorporated in static converters for tubes with grid control
- H02M1/042—Circuits specially adapted for the generation of grid-control or igniter-control voltages for discharge tubes incorporated in static converters for tubes with grid control wherein the phase of the control voltage is adjustable with reference to the AC voltage
Description
Wenn induktive Wechselstromverbraudier, die über Entladungsstrecken in gegensinniger Parallelschaltung gespeist werden, periodisch .ein- und ausgeschaltet werden, wie es beispielsweise bei den bekannten Nahtschweißmaschinen der 'Fall ist, so tritt unter Umständen in dem VerbraucherstiOmkreis, bei Nahtschweißmaschinen also in dem Primärstromkreis des Schweißtransformators, eine Gleich-Stromkomponente auf, die dem Wechselstrom überlagert ist und auf diese Weise eine Vormagnetisierung des induktiven Verbrauchers bewirkt. Diese Vormagnetisierung verschwindet während der Ausschaltperiode nicht vollständig und wächst infolgedessen beim nächsten Einschalten auf einen noch höheren Betrag an. Dieses Spiel wiederholt sich so lange, bis schließlich die Vormagnetisierung auf einen solchen Betrag angewachsen ist, daß die Induktivität des Verbrauchers fast völlig verschwunden ist, was praktisch einen Kurzschluß für die Anlage bedeutet.When inductive alternating currents are consumed, which are fed via discharge paths in opposite directions in parallel, periodically . be switched on and off, like for example If this is the case with the known seam welding machines, it may occur in the consumer group, with seam welding machines So in the primary circuit of the welding transformer, a direct current component on, which is superimposed on the alternating current and in this way a premagnetization of the inductive consumer causes. This bias does not disappear during the switch-off period completely and consequently grows to an even higher one the next time it is switched on Amount to. This game repeats itself until finally the premagnetization has grown to such an amount that the inductance of the consumer is almost has completely disappeared, which practically means a short circuit for the system.
Das Auftreten dieser Gleichstromkomponente im Verbraucherkreis kann verschiedene Ursachen haben. Werden beispielsweise die Entladungsgefäße nicht voll ausgesteuert, so kann infolge von Ungenauigkeiten in der Steuerung das eine Entladungsgefäß während eines größeren Teiles der· Halbwelle stromdurchlässiger sein als das andere. Auf diese Weise wird in der einen Richtung eine größere Elektrizitätsmenge durch den Verbraucher befördert als in der anderen Richtung, - was mit dem Vorhandensein einer Gleichstromkomponente gleichbedeutend ist. Ein anderer Grund für die Entstehung einer Gleichstromkomponente kann beispielsweise der sein, daß die Zündung der Entladungsstrecken nicht in einem solchen Zeitpunkt erfolgt, daß sich sofort ein stationärer Stromverlauf einstellen kann, sondern daß die Stromkurve anfänglich gegenüber der Nullinie einseitig verschoben ist und auf diese Weise eine Gleichstromkomponente in den Verbraucherstromkreis hineingebracht wird. Eine feste Einstellung der Zündung auf einen Zeitpunkt, bei dem sich sofort ein angenähert stationärer Stromverlauf einstellen kann, ist im allgemeinen nicht möglich, da dieser Zeitpunkt von der Phasenverschiebung zwischen Verbraucherstrom und Verbraucherspannung abhängt. Diese Phasenverschiebung ist aber unter Umständen raschen Veränderungen unterworfen; bei Nahtschweißmaschinen wirdThe occurrence of this direct current component in the consumer circuit can be different Have causes. If, for example, the discharge vessels are not fully controlled, then so can cause one discharge vessel during a larger part of the half-wave be more current-permeable than the other. To this A larger amount of electricity is transported through the consumer in one direction than in the other direction, - what about the presence of a direct current component is equivalent. Another reason for the generation of a DC component can be, for example, that the ignition of the discharge paths does not take place at such a point in time that a steady-state current curve can be established immediately, but that the current curve is initially shifted on one side with respect to the zero line and in this way a DC component is brought into the consumer circuit. A firm one Setting the ignition to a point in time at which an immediately approximated stationary Can adjust the current course is generally not possible, since this point in time depends on the phase shift between consumer current and consumer voltage. However, this phase shift is subject to rapid changes under certain circumstances; in seam welding machines
*) Von dem Patentsucher ist als der Erfinder angegeben worden:*) The patent seeker stated as the inventor:
Dr. Karl Etsrodt in Berlin-Siemensstadt.Dr. Karl Etsrodt in Berlin-Siemensstadt.
sie beispielsweise wesentlich von Ungleichheiten im Material, Veränderungen im Elektrodendruck usw. beeinflußt.For example, they depend largely on inequalities in the material, changes in the electrode pressure etc. influenced.
Durch die Erfindung soll nun verhütetThe invention is now intended to prevent
• 5 werden, daß in Stromrichteranlagen der genannten Art unzulässig hohe Gleichströme in dem VerbraucherkreiB entstehen und die Entladungsgefäße gefährden. Erfindungsgemäß wird eine im Verbraucherstromkreis auftretende Gleichstrom- bzw. Gleichspannungskomponente auf den Steuerkreis eimer oder beider der gegensinnig parallel geschalteten Entladungsstrecken so zur Einwirkung gebracht, daß die Steuerung der Entladungs-• 5 that in converter systems of the type mentioned inadmissibly high direct currents arise in the consumer group and the Endanger discharge vessels. According to the invention, an occurring in the consumer circuit DC or DC voltage components on the control circuit bucket or both of the discharge paths connected in parallel in opposite directions are brought into effect in such a way that that the control of the discharge
strecken im Sinne der'Verminderung der im Verbraucherstromkreis fließenden Gleich-stretch in the sense of reducing the im Consumer circuit flowing direct
- Stromkomponente verändert wird. Handelt es sich bei den Entladungsstrecken um. solche mit Dampf- oder Gasfüllung, so kann die Gleichstromkomponente in dem Verbraucherkreis auf einfachste Weise dadurch zum Verschwinden gebracht werden, daß die gegenseitige Lage der Zündpunkte der Entladungsstrecken geändert wird. Diese Beeinflussung der Steuerung der Entladungsstrecken kann zusätzlich zu sonstigen Regeleingriffen, die die Verlegung der Zündpunkte bezwecken, erfolgen. Die Schaltung gemäß der Erfindung kann also auch bei solchen Anlagen verwendet werden, bei denen die Zündpunkte der Entladungsstrecken bereits in Abhängigkeit von anderen Betriebsgrößen verändert werden. Es spielt dabei keine Rolle, welcher Art die Steuereinrichtung ist, die die Steuerspannungen der Entladungsstreeken liefert; besonders vorteilhaft dürfte jedoch -für_die Durchführung des Erfindungsgedankens eine ■ sogenannte ruhende Steuerung sein, die beispielsweise mit gleichstromvormagnetisierten, durch Wechselstrom bis in den Bereich hoher Sättigung erregten Gittertransformatoren arbeitet. In diesem Fall kann man die Gleichstromvormagnetisierung des Steuerspannungstransformators durch die 'Gleichstromkomponente des Verbraucherstromkreises beeinflussen und auf diese Weise die Zündpunkte der Entladungsgefäße regeln.- Current component is changed. Is it the discharge path. such with steam or gas filling, the direct current component in the consumer circuit can be made to disappear in the simplest way by the fact that the mutual The location of the ignition points of the discharge paths is changed. This can influence the control of the discharge paths in addition to other control interventions that aim to relocate the ignition points, take place. The circuit according to the invention can also be used in such systems are used in which the ignition points of the discharge paths are already dependent can be changed by other operating parameters. It doesn't matter which one Type is the control device that supplies the control voltages of the discharge lines; however, one should be particularly advantageous for the implementation of the inventive concept ■ so-called dormant control, for example with direct-current pre-magnetized, Grid transformers excited by alternating current up to the area of high saturation is working. In this case one can use the DC bias of the control voltage transformer through the 'direct current component of the consumer circuit and in this way regulate the ignition points of the discharge vessels.
In der Zeichnung ist ein Ausführungsbeispiel der Erfindung dargestellt. Die Primärwicklung eines Schweißtransformators 3, dessen Sekundärwicklung zur Speisung der Schweißstelle 4 dient, wird über gittergesteuerte Entladungsstreeken 1 und 2 in gegensinniger Parallelschaltung aus einem Wechselstromnetz gespeist. Das Steuergerät für die Entladungsstreeken ist mit 5 bezeichnet; es kann in irgendeiner bekannten Weise ausgebildet sein. Um nun die Steuerung der Entladungsstreeken in Abhängigkeit von einer in dem Verbraucherstromkreis auftretenden Gleichstromkomponente zu beeinflussen, wird das Steuergerät über eine Einrichtung 7, die zum Aussieben der Gleichstromkomponente aus dem Verbraucherstrom dient, an einen Meßwiderstand 6 angeschlossen, der in dem Verbraucherstromkreis, im vorliegenden Fall also in dem Primärstromkreis des Schweißtransformators 3, liegt.An exemplary embodiment of the invention is shown in the drawing. The primary winding a welding transformer 3, the secondary winding of which is used to feed the welding point 4, is grid-controlled Discharge lines 1 and 2 in opposite directions in parallel from one AC mains powered. The control device for the discharge lines is denoted by 5; it can be designed in any known manner. Now to control the Discharge intervals as a function of one that occurs in the consumer circuit To influence the direct current component, the control unit via a device 7, the serves to filter out the direct current component from the consumer current, to a Measuring resistor 6 connected, which is in the consumer circuit, in the present case so in the primary circuit of the welding transformer 3 is located.
Claims (3)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DES120555D DE652967C (en) | 1935-11-23 | 1935-11-23 | Circuit for the protection of converter systems in which inductive alternating current consumers, which are repeatedly switched on and off, preferably welding transformers, are fed via controllable discharge paths connected in parallel in opposite directions, in particular those with gas or steam filling |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DES120555D DE652967C (en) | 1935-11-23 | 1935-11-23 | Circuit for the protection of converter systems in which inductive alternating current consumers, which are repeatedly switched on and off, preferably welding transformers, are fed via controllable discharge paths connected in parallel in opposite directions, in particular those with gas or steam filling |
Publications (1)
Publication Number | Publication Date |
---|---|
DE652967C true DE652967C (en) | 1937-11-10 |
Family
ID=7535257
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DES120555D Expired DE652967C (en) | 1935-11-23 | 1935-11-23 | Circuit for the protection of converter systems in which inductive alternating current consumers, which are repeatedly switched on and off, preferably welding transformers, are fed via controllable discharge paths connected in parallel in opposite directions, in particular those with gas or steam filling |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE652967C (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1107808B (en) * | 1956-11-10 | 1961-05-31 | Schlatter Ag | Circuit for controlling alternating current circuits by means of a gas discharge tube |
DE102005011554A1 (en) * | 2005-03-14 | 2006-09-21 | Siemens Ag | Transformer primary winding`s DC voltage portion compensating method for alternating current-railway vehicle, involves using corresponding back electromotive force for compensating DC voltage supply portion at primary winding |
-
1935
- 1935-11-23 DE DES120555D patent/DE652967C/en not_active Expired
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1107808B (en) * | 1956-11-10 | 1961-05-31 | Schlatter Ag | Circuit for controlling alternating current circuits by means of a gas discharge tube |
DE102005011554A1 (en) * | 2005-03-14 | 2006-09-21 | Siemens Ag | Transformer primary winding`s DC voltage portion compensating method for alternating current-railway vehicle, involves using corresponding back electromotive force for compensating DC voltage supply portion at primary winding |
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