Circuit arrangement for detecting grounds in a static converter

Details Circuit arrangement for detecting grounds in a static converter Circuit arrangement for detecting grounds in a static converter

1978-03-23

1980-04-15

Swann, III, Glen R.

Communications: electrical

Condition responsive indicating system

Specific condition

324 51, 361 47, G08B 2100

Patent

active

041986288

ABSTRACT:
Three voltage transformers have primary windings whose first ends are connected, respectively, to three a-c leads of a static converter and whose second ends are connected together to form an artificial neutral point. A high value resistor is connected between the neutral point and ground and a current-measuring means measures the current flowing in the resistor and generates an alarm signal in the event such current indicates a ground in the converter. Also disclosed is an arrangement including two high voltage converters connected to each other through smoothing chokes to form a frequency changer or converter in which the two converters have substantially identical circuit arrangements for detecting grounds with the circuit arrangements for detecting grounds having their outputs connected to each other.

REFERENCES:
patent: 1270894 (1918-07-01), Steinmetz
patent: 2428563 (1947-10-01), Fountain
patent: 3293497 (1966-12-01), Brandler et al.
patent: 3852641 (1974-12-01), Titus
patent: 4099215 (1978-07-01), Parrier et al.

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