Earth fault supervision for medium frequency converter - has fully insulated load circuit and capacitor coupled detector bridge

The application is typically to medium frequency converters used for supplying induction surfaces at about 1000 Hz. The output of the rectifier (2) or inverter (4) is connected via decoupling capacitors (81) to a bridge circuit (82, 83, 84, 85). The bridge output resistor (86) generates a signal to...

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Bibliographische Detailangaben
Hauptverfasser:	WAECHTER,HERBERT, GRASSMANN,HANSRISTIAN
Format:	Patent
Sprache:	eng ; ger
Schlagworte:	APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC,OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWERSUPPLY SYSTEMS CONTROL OR REGULATION THEREOF CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUTPOWER CONVERSION OR DISTRIBUTION OF ELECTRIC POWER ELECTRICITY EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS GENERATION MEASURING MEASURING ELECTRIC VARIABLES MEASURING MAGNETIC VARIABLES PHYSICS TESTING
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Beschreibung
Zusammenfassung:	The application is typically to medium frequency converters used for supplying induction surfaces at about 1000 Hz. The output of the rectifier (2) or inverter (4) is connected via decoupling capacitors (81) to a bridge circuit (82, 83, 84, 85). The bridge output resistor (86) generates a signal to act on alam and trip circuits (6, 61). With the main circuit healthy, the bridge output is adjusted until the current in the load resistor (86) is insufficient to trip the protection. Should an earth occur on either the ac or dc circuits of the converter the potential across the resistor rises and current flows to trip the protection.