Siemens Aktiengesellschaft

Bruno Muller

Werner Kohler

Ulrich Baumgartl

Hartmut Ritter

Arrangement and method for identifying and localizing faulty circuits of

In a circuit arrangement for measuring currents at high potential, a capacitor, charged in accordance with the current to be measured, is shunted by a light emitting diode which generates a light pulse sequence with a frequency proportional to the current. In series with the diode is a switching element with a control terminal, to which the output of a control device is connected. The input of the control device is connected to a threshold arrangement disposed parallel to the capacitor and the supply terminals of the control device are connected to the capacitor.

Circuit arrangement for measuring currents at high potential

A switching apparatus adapted to be used with medium-voltage cable networks comprising switching units each of which is of the single-pole type and each of which includes an encapsulation adapted to be embedded directly in the soil and means for actuating the unit in response to a remote control. The switching apparatus is particularly suited for medium-voltage cable networks in cities where the erection of above-ground distribution facilities is undesirable and expensive. The switching units may, preferably, be designed as vacuum circuit breakers.

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Berlin, Germany

Bruno Muller