ZUSTANDSSIGNALBILDUNG ZUR ANZEIGE DES UEBERGANGES IN DIE BETRIEBSART "BYPASS" BEI EINER EINRICHTUNG ZUR HOCHSPANNUNGSGLEICHSTROMUEBERTRAGUNG.

The bypass condition signal formation for HV DC transmission uses detection of the current regulator transformer currents (Iry, Isy, Ity, Ird, Isd, Itd) on the current regulator side, which are weighted by different weighting factors before summation. The summation value has no zero range during the normal commutation sequence with the bypass condition signal supplied when the sum current is zero after a given time interval from interruption of the normal commutation sequence. This time interval is at least equal to the commutation of the DC current (Ig) by the selected thyristor valves. Pref. all the weighting/actors are different but all have the same sign.

Verfahren und Einrichtung zur Steuerung oder Regelung einer umrichtergespeisten, selbstgesteuerten Synchronmaschine

Verfahren zur Bildung der Steuersignale eines Pulswechselrichters für die Drehzahlsteuerung von Drehfeldmaschinen

CIRCUIT FOR IMPROVING THE FIRING ANGLE SYMMETRY OF THE FIRING PULSES PROVIDED BY A CONTROL ELEMENT TO A MULTIPHASE RECTIFIER

UEBERWACHUNGSEINRICHTUNG FUER DIE KONDENSATORBATTERIE EINES GLEICHSTROMFILTERKREISES

VERFAHREN UND VORRICHTUNG ZUR ENTKOPPLUNG DER WIRK- UND BLINDLEISTUNGSREGELUNG BEI EINER ZWEI NETZE VERBINDENDEN HOCHSPANNUNGS-GLEICHSTROM-UEBERTRAGUNGSSTRECKE

SCHALTUNGSANORDNUNG MIT EINER ANZAHL VON UMRICHTERN, INSBESONDERE VON DIREKTUMRICHTERN IN STERNSCHALTUNG

VERFAHREN UND VORRICHTUNG ZUM UNTERDRUECKEN VON RESONANZERSCHEINUNGEN IM WECHSELRICHTERSEITIGEN WECHSELSPANNUNGSNETZ EINER HOCHSPANNUNGSGLEICHSTROMUEBERTRAGUNGSANLAGE

UEBERWACHUNGSEINRICHTUNG FUER DIE SPANNUNGSBELASTUNG EINES KONDENSATORS

MONITORING DEVICE OF THE VOLTAGE STRESS OF AN ELECTRICAL DEVICE

SURVEILLANCE APPARATUS FOR A BATTERY OF CONDENSATORS IN A DIRECT CURRENT FILTERING CIRCUIT

Device for monitoring the temperature of an electrical component

Electrical power semiconductors (T) which are cooled via heat sinks (K) and a cooling medium, particularly the environmental air, must be monitored with regard to a maximum temperature not being exceeded on the semiconductor (T). For this purpose, the temperature (TL) of the cooling medium and the power dissipation on the power semiconductor (T) is determined. The temperature (TT) on the semiconductor (T) is determined via a converter (U3), the conversion characteristic of which is determined in accordance with the thermal model of power semiconductor (T), heat sink (K) and cooling medium. This ensures a temperature determination with very low inertia and relative accuracy. ...

Method and device for the quick detection of power system faults

For the quick detection of power system faults, the voltages (UP) of a power system (NS) to be monitored are mapped into one or more reference systems (DRS1, ...). Their "dynamic reference voltages" are identical to the power system voltages in frequency and phase angle. Where there are more reference systems, the amplitudes of the reference voltages are preferably graded with respect to one another in such a manner that, apart from the quick detection of possible deviations of the power system voltages from the reference voltages, it is also possible to detect the type of power system fault. It is particularly advantageous to use the invention for initiating special control measures in the case of a power system fault in the case of the "back-to-back" HVDC coupling of power systems. ...

Earth connection monitoring circuit for HV line - compares hysteresis of two parallel paths at opposite ends of choke

The earth connection monitoring circuit for a h.v.d.c. line (1) includes a choke (4) in series with a capacitor (3) between the line and earth. This forms a high pass including a resistance (17) across the choke coil. Between the capacitor and choke is a current converter (5). A second current converter (6) is positioned at the other end of the choke. These are connected to a comparison circuit controlling a switch (2) between the capacitor and the line. Two parallel lines, each with a proportional amplifier (7,10), a rectifier (8,11) and a low pass filter (9,12) are connected by a comparator (13) to a trigger circuit (19) and a timer (15) form the comparison system, to give an earth signal when the output signal lasts for more than a given time. The system compares the difference in hysteresis between the parallel lines.

VERFAHREN UND VORRICHTUNG ZUR ENTKOPPELUNG DER WIRK- UND BLINDLEISTUNGSREGELUNG BEI EINER ZWEI NETZE VERBINDENDEN HOCHSPANNUNGS-GLEICHSTROM-UEBERTRAGUNGSSTRECKE.

The output signal of the superior voltage or reactive power controller (Rq) receives a pre control variable with negative sign. The output signal of the superior effective-power controller (Rp) receives a further precontrol variable. The two precontrol variables are dependent on specified quantities. The cotnrol angle setting for the converter (UR2) is given by an turn-off angle control (R1) and the associated ref. turn-off angle from the superior voltage or reactive power controller (Rq).

PROCESS AND DEVICE FOR SUPPRESSING RESONANCE EFFECTS WITHIN THE AC CONVERTER OF AN AC VOLTAGE NETWORK IN A HVDC TRANSMISSION DEVICE

SCHALTUNGSANORDNUNG MIT EINER ANZAHL VON UMRICHTERN, INSBESONDERE VON DIREKTUMRICHTERN IN STERNSCHALTUNG

Method and device for disconnecting the active and reactive power supply of a two-network high-voltage direct-current power transmission link

DEVICE FOR THE FUNCTIONAL MONITORING OF ANALOGUE THREE-CHANNEL CONTROL SYSTEM

Schaltungsanordnung zur verbesserung der zuendwinkelsymmetrie der zuendimpulse eines steuersatzes fuer einen mehrpulsigen stromrichter.

Einrichtung zur Regelung des Effektivwertes einer pulsierenden Regelgroesse