DE543481C - Device for switching on transformers and similar electrical apparatus - Google Patents
Device for switching on transformers and similar electrical apparatusInfo
- Publication number
- DE543481C DE543481C DES95321D DES0095321D DE543481C DE 543481 C DE543481 C DE 543481C DE S95321 D DES95321 D DE S95321D DE S0095321 D DES0095321 D DE S0095321D DE 543481 C DE543481 C DE 543481C
- Authority
- DE
- Germany
- Prior art keywords
- transformers
- switch
- switching
- electrical apparatus
- similar electrical
- 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
- 239000000463 material Substances 0.000 claims description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 229910052742 iron Inorganic materials 0.000 description 2
- 230000010355 oscillation Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/001—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection limiting speed of change of electric quantities, e.g. soft switching on or off
- H02H9/002—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection limiting speed of change of electric quantities, e.g. soft switching on or off limiting inrush current on switching on of inductive loads subjected to remanence, e.g. transformers
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Protection Of Transformers (AREA)
Description
Einrichtung zum Einschalten von Transformatoren und ähnlichen elektrischen Apparaten Beim Einschalten von Transformatoren treten bekanntlich Einschaltschwingungen auf, wobei der Einschaltstrom unter Umständen das io- bis 2ofache des normalen Stromes erreichen kann. Die Größe des Einschaltstromes hängt von der Sättigung des Eisens und davon ab, in welchem Punkt der Spannungskurve eingeschaltet wird. Diese Einschaltschwingung dauert je nach der Dämpfung des Kreises einige Sekunden, so daß der Schalter, durch den der Transformator eingeschaltet wird, auslöst. Es ist deshalb vorgeschlagen worden, die Transformatoren nicht sofort an die volle Spannung anzuschalten, sondern sie erst über einen Widerstand an die Netzspannung zu legen. Dazu dienen Schalter mit Vorkontakten. Durch die Erfindung werden diese Schalter überflüssig, die wegen ihres sperrigen Aufbaues viel Platz. wegnehmen.Device for switching on transformers and similar electrical Apparatus It is well known that switch-on oscillations occur when transformers are switched on on, whereby the inrush current may be 10 to 2 times the normal current can reach. The size of the inrush current depends on the saturation of the iron and from the point at which the voltage curve is switched on. This switch-on oscillation takes a few seconds, depending on the attenuation of the circuit, so that the switch goes through which the transformer is switched on triggers. It is therefore suggested not to switch the transformers to full voltage immediately, but rather first to connect it to the mains voltage via a resistor. Switches are used for this with previous contacts. The invention makes these switches superfluous because of a lot of space due to its bulky structure. take away.
Gemäß der Erfindung wird zwischen Schalter und Transformator ein Widerstand mit positiven Temperaturkoeffizienten geschaltet und die Größe dieses Widerstandes so bemessen und sein Material so gewählt, daß der Einschaltstrom auf einen geringeren Wert als der des Auslösestromes des Schalters in einer Zeit herabgesetzt wird, die kleiner als die Auslösezeit des Schalters ist. Anordnungen, bei denen Widerstände mit positiven Temperaturkoeffizienten verwendet werden, sind bekannt. Bei diesen Anordnungen werden aber die Widerstände zu einem anderen Zweck, nämlich zur Begrenzung des Kurzschlußstromes, verwendet. Durch die Erfindung wird die Eigenschaft der Widerstände mit positiven Temperaturkoeffizienten ausgenutzt, um ein störungsfreies Einschalten von Transformatoren oder ähnlichen Apparaten zu erreichen.According to the invention, there is a resistor between the switch and the transformer switched with positive temperature coefficients and the size of this resistance so dimensioned and its material chosen so that the inrush current to a lower Value than that of the tripping current of the switch is reduced in a time that is less than the tripping time of the switch. Arrangements in which resistors with positive temperature coefficients are known. With these Arrangements, however, use the resistors for a different purpose, namely to limit of the short-circuit current. The invention makes the property of the resistors with positive temperature coefficients used to ensure trouble-free switch-on from transformers or similar devices.
Das Material, aus dem der Widerstand besteht, kann z. B. Eisen oder jedes andere Material mit positivem Temperaturkoeffizienten sein. Zweckmäßig wird man den Widerstand, wenn er starke Erhitzung aushalten soll, in einem luftleeren Raum oder auch in einem mit indifferentem Gas angefüllten Raum anordnen.The material from which the resistor is made can e.g. B. iron or be any other material with a positive temperature coefficient. Will be expedient the resistance, if it is to withstand intense heating, is in a vacuum Arrange space or in a space filled with inert gas.
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DES95321D DE543481C (en) | 1929-12-01 | 1929-12-01 | Device for switching on transformers and similar electrical apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DES95321D DE543481C (en) | 1929-12-01 | 1929-12-01 | Device for switching on transformers and similar electrical apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE543481C true DE543481C (en) | 1932-02-05 |
Family
ID=7519287
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DES95321D Expired DE543481C (en) | 1929-12-01 | 1929-12-01 | Device for switching on transformers and similar electrical apparatus |
Country Status (1)
| Country | Link |
|---|---|
| DE (1) | DE543481C (en) |
-
1929
- 1929-12-01 DE DES95321D patent/DE543481C/en not_active Expired
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| DE2523251B2 (en) | EARTH FAULT CIRCUIT FOR A THREE WIRE SINGLE-PHASE SYSTEM | |
| DE855602C (en) | Arrangement to limit overcurrents in electrical circuits, especially high-voltage networks | |
| DE543481C (en) | Device for switching on transformers and similar electrical apparatus | |
| DE823752C (en) | Device for protecting a part of an electrical power plant against internal faults in this part | |
| DE945335C (en) | Bimetal release heated by a transducer core | |
| DE597076C (en) | Thermostat switches, in particular for regulating the temperature of electrically heated devices | |
| DE342144C (en) | Zero point grounding | |
| EP0019904A1 (en) | Overcurrent protective relais | |
| DE738865C (en) | Device for limiting the inrush current in transformers | |
| DE1067928B (en) | Test arrangement for residual current circuit breakers | |
| DE2556433C3 (en) | Arrangement for power control of electric hotplates | |
| DE493405C (en) | Switch with triggering by an overcurrent coil, the sensitivity of which is changed by a thermostat that partially bypasses the coil | |
| AT292140B (en) | Protection circuit for electrically heated blankets, upholstery or the like. | |
| DE893097C (en) | Circuit arrangement for the ignition and operation of electrical gas or vapor-filled discharge tubes with direct current | |
| DE723212C (en) | Protection device for step transformers | |
| DE710704C (en) | Contact protection circuit for alternating current networks | |
| DE527250C (en) | Arrangement for electrical devices whose circuit is monitored by a thermostatic main switch with a heating coil | |
| AT262563B (en) | Device for drying damp walls | |
| AT203083B (en) | Protective device for locating and disconnecting AC power lines in the event of fault currents | |
| DE368174C (en) | High-frequency apparatus with glow cathode tubes as a vibration generator, especially for diathermy purposes | |
| DE613571C (en) | Pre-contact resistor for a switch with expansion chamber | |
| DE531633C (en) | Overcurrent release for electrical switches | |
| AT126073B (en) | Protective device for generators. | |
| DE413463C (en) | Circuit arrangement for Faradization inductors | |
| AT133840B (en) | Protective device for electrical system parts. |