DE601784C - Arrangement for protecting capacitors in AC networks against overcurrents - Google Patents
Arrangement for protecting capacitors in AC networks against overcurrentsInfo
- Publication number
- DE601784C DE601784C DES103283D DES0103283D DE601784C DE 601784 C DE601784 C DE 601784C DE S103283 D DES103283 D DE S103283D DE S0103283 D DES0103283 D DE S0103283D DE 601784 C DE601784 C DE 601784C
- Authority
- DE
- Germany
- Prior art keywords
- capacitors
- capacitor
- current
- switch
- network
- 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
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/16—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for capacitors
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Testing Electric Properties And Detecting Electric Faults (AREA)
- Measurement Of Current Or Voltage (AREA)
- Protection Of Static Devices (AREA)
Description
Statische Kondensatoren, welche in Wechselstromnetzen zur Lieferung von Bündstrom oder zu anderen Zwecken verwendet werden, müssen gegen Überstrom geschützt werden. Zu diesem Zweck wurden bisher meist spannungsabhängige Schutzeinrichtungen vorgesehen, da die Stromaufnahme eines Kondensators normalerweise proportional der Spannung zunimmt. Schließt man beispielsweise einen Kondensator bzw. eine Kondensatorgruppe über einen Leitungsschalter an ein Wechselstromnetz an, so war es bisher üblich, diesen Schalter beim Anstieg der Wechselspannung über einen bestimmten Maximalwert auszuschalten und nach dem Verschwinden der Überspannungserscheinung wieder mit dem Netz zu verbinden.Static capacitors, which are used in alternating current networks for the delivery of bundle current or used for other purposes must be protected against overcurrent. To this Purpose so far mostly voltage-dependent protective devices have been provided, since the Current consumption of a capacitor normally increases proportionally to the voltage. For example, if a capacitor or a capacitor group is closed via a line switch to an alternating current network, it was customary to use this switch when rising to switch off the alternating voltage above a certain maximum value and after If the overvoltage phenomenon disappears, reconnect it to the grid.
Es hat sich nun aber herausgestellt, daß Überstromerscheinungen an Kondensatoren auch noch aus anderen Gründen auftreten können.But it has now been found that overcurrent phenomena on capacitors too can occur for other reasons.
ao Die zum Schutz der Kondensatoren bisher verwendeten spannungsabhängigen Einrichtungen sprechen nur auf den Effektivwert der Wechselspannung an. Der Effektivwert des Stromes, der von dem Kondensator aufgenommen wird und der daher für die Belastung des Kondensators ausschlaggebend ist, hängt aber nicht nur von dem Effektivwert der Wechselspannung ab, sondern wird auch wesentlich mitbestimmt durch die Amplituden von Oberschwingungen, welche in der Wechselspannung enthalten sind. In einer bestehenden Anlage wurde beispielsweise beobachtet, daß gerade in Zeiten verhältnismäßig schwacher Belastung von den Kondensatoren bei normaler Spannung ein- wesentlich größerer Strom aufgenommen wurde als zu Zeiten höherer Belastung bei gleicher Spannung. Diese Unterschiede in der Stromaufnahme rühren von Unterschieden in der Kurvenform der Wechselspannung her. Mit den normalen spannungsabhängigen Schutzeinrichtungen lassen sich die Kondensatoren gegen diese Überstromerscheinungen nicht schützen.ao The voltage-dependent devices previously used to protect the capacitors only respond to the rms value of the alternating voltage. The effective value of the current, which is absorbed by the capacitor and therefore the load on the capacitor is decisive, but not only depends on the rms value of the alternating voltage, but is also largely determined by the amplitudes of harmonics, which are contained in the alternating voltage. For example, in an existing system observed that especially in times of relatively low load on the capacitors at normal voltage, a much larger current was consumed than at times higher load with the same voltage. These differences in power consumption stir from differences in the waveform of the alternating voltage. With the normal voltage-dependent The capacitors can be protected against these overcurrent phenomena not protect.
An Stelle der spannungsabhängigen Schutzeinrichtungen ist bereits vorgeschlagen worden, stromabhängige Schutzeinrichtungen zu verwenden. Das Problem, die Kondensatoren gegen vorübergehende Erscheinungen zu schützen, die durch die wechselnde Kurvenform der Netzspannung bestimmt sind, läßt sich jedoch auch mit diesen Einrichtungen nicht vollkommen lösen. Denn die Überstromschutzeinrichtungen sprechen zwar auf die Überstromerscheinungen an, welche durch eine Änderung der JKurvenform der Netzspannung bedingt sind, sie versagen jedoch, wenn nach dem Abschalten festgestellt werden soll, wann die Kondensatoren wieder zugeschaltet werden können, wann also die Spannungsoberwellen, welche die Überströme verursachten, wieder aus der Spannungswelle verschwunden sind. Instead of the voltage-dependent protective devices, it has already been proposed that to use current-dependent protective devices. The problem that capacitors oppose To protect temporary phenomena caused by the changing waveform of the mains voltage are determined, but cannot be completely resolved even with these facilities. Because the overcurrent protection devices respond to the overcurrent phenomena caused by a change in the shape of the curve the mains voltage, but they fail if detected after switching off should be, when the capacitors can be switched on again, that is, when the voltage harmonics that caused the overcurrents have disappeared from the voltage wave.
Aufgabe der Erfindung ist es, diesen Übel- · stand zu beseitigen. Erfindungsgemäß werden parallel zu den zu schützenden Kondensatoren Meßkondensatoren über stromabhängige Steuereinrichtungen an das Wechselstromnetz angeschlossen. Die Meßkondensatoren werden dabei für einen vergleichsweise höheren Belastungsstrom bemessen als die zu schützenden Haupt- The object of the invention is to eliminate this deficiency. Be according to the invention parallel to the capacitors to be protected measuring capacitors via current-dependent control devices connected to the AC network. The measuring capacitors are dimensioned for a comparatively higher load current than the main to be protected
Claims (1)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DES103283D DE601784C (en) | 1932-02-16 | 1932-02-16 | Arrangement for protecting capacitors in AC networks against overcurrents |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DES103283D DE601784C (en) | 1932-02-16 | 1932-02-16 | Arrangement for protecting capacitors in AC networks against overcurrents |
Publications (1)
Publication Number | Publication Date |
---|---|
DE601784C true DE601784C (en) | 1934-08-24 |
Family
ID=7525050
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DES103283D Expired DE601784C (en) | 1932-02-16 | 1932-02-16 | Arrangement for protecting capacitors in AC networks against overcurrents |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE601784C (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1076257B (en) * | 1959-04-28 | 1960-02-25 | Siemens Ag | Method and device for monitoring electrical capacitors in networks containing harmonics |
-
1932
- 1932-02-16 DE DES103283D patent/DE601784C/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1076257B (en) * | 1959-04-28 | 1960-02-25 | Siemens Ag | Method and device for monitoring electrical capacitors in networks containing harmonics |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
DE601784C (en) | Arrangement for protecting capacitors in AC networks against overcurrents | |
DE735657C (en) | Protective device for multi-phase AC systems that are subject to changing working conditions | |
DE823752C (en) | Device for protecting a part of an electrical power plant against internal faults in this part | |
DE725747C (en) | Circuit arrangement for the protection of power lines against operational disturbances | |
DE520365C (en) | Surge arrester for electrical high-voltage systems with voltage-dependent arrester resistance | |
DE820463C (en) | Circuit arrangement for protecting electrical lines against overload, especially in telecommunications systems | |
DE740198C (en) | Arrangement for the compensation of the corona discharges at the earth fault point of high voltage AC power lines | |
DE19634438A1 (en) | Fault current or differential current (FI/DI) protection and G-type monitoring devices for dangerous shock currents | |
AT359585B (en) | DEVICE FOR PROTECTION AGAINST OVERVOLTAGE | |
DE492765C (en) | Device for the automatic earthing of AC lines in the event of overcurrent | |
DE637436C (en) | Arrangement to prevent incorrect response of the differential protection of inductances, for example transformers, or of capacities | |
DE627076C (en) | Overload protection for compensation devices | |
DE658161C (en) | Device for protecting AC lines | |
DE849139C (en) | Contact protection switch | |
DE563138C (en) | Device to protect parallel lines | |
DE552427C (en) | Protective arrangement in direct or alternating current systems with a resistor in the earthed neutral conductor | |
DE330667C (en) | Protection circuit against fault current for parallel conductors of the same phase | |
DE664591C (en) | Protective device against impermissible increases in the excitation current of alternators | |
AT202215B (en) | Differential protection device for electrical system parts. | |
DE677483C (en) | Device for briefly increasing a fault current | |
DE410008C (en) | Circuit for relay with current and voltage winding in alternating current networks | |
DE370089C (en) | Device for the protection of subdivided line networks in which the effect of the voltage drop on timing relays is used | |
DE747996C (en) | Surge arrester arrangement for the regulating winding of high-voltage regulating transformers in the course of the power line | |
DE687258C (en) | Mesh network with several supply lines that belong in groups to several feed systems | |
AT203083B (en) | Protective device for locating and disconnecting AC power lines in the event of fault currents |