Siemens Aktiengesellschaft

Marco Bruell

Peter Kopaczewski

Andre Borgwardt

Michael Gerstner

Christoph Boerzsoenyi

Ilka Jakubowski

A power value for a low-voltage AC circuit, such as low-voltage circuit breaker, is derived. A voltage between conductors of the low-voltage AC circuit is ascertained and a current of at least one conductor is ascertained by a Rogowski coil, which outputs an analog voltage that is an equivalent to the level of the electric current. The analog voltage of the Rogowski coil is integrated and then digitized, and the level of the voltage is digitized. A power value is calculated in each case from a sample value of the current and an interpolated voltage value. The interpolated voltage value is in each case ascertained from two successive sample values of the voltage such that a phase error generated by the Rogowski coil or/and the integrator is compensated for in relation to the electric current in the conductor and a phase error-free power value is ascertained.

Low-voltage circuit breaker and power measuring arrangement

A circuit-breaker includes an electronic trip unit, which initiates an interruption or reduction of the current flow in a low-voltage circuit when current or current-time limits are exceeded in the low-voltage circuit. The electronic trip unit includes at least two processors that independently check whether current or current-time limits are being exceeded. A test signal is fed to the circuit-breaker via a first communication interface, which is fed to one of the two processors during operation so that a test of the circuit-breaker is carried out during operation, while at the same time an active protection is provided with regard to the exceeding of current or current-time limits.

Circuit-breaker and mobile device

A circuit breaker for a low-voltage circuit is disclosed. In an embodiment, the circuit breaker includes a current conductor, assigned a measuring transducer for measuring the electrical current of the current conductor; a first filter connected to the measuring transducer; an analog/digital converter connected to the first filter; a second, high-pass filter connected to the analog/digital converter; and a digital integrator, connected to the high-pass filter and configured to determine the electrical current of the current conductor.

Growing community of inventors

Berlin, Germany

Marco Bruell