Residual-current circuit breaker
AssigneeMoeller Gebaudeautomation GmbH
InventorsRAINER MEISEL, GEORG RITZINGER
Life of this patent
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Abstract
A residual-current circuit breaker includes a summation current transformer having a core, a first secondary winding wound onto the core, and at least one second secondary winding wound onto the core, with lines of an electric network to be protected extending through the core. A tripping apparatus is operably connected to break contacts for opening the break contacts. A first arrangement is provided for detecting alternating residual currents and connected to the first secondary winding of the summation transformer. A second arrangement is connected to the second secondary winding for detecting direct residual currents, wherein a predeterminable alternating operation of the first and second arrangements is controlled by a timer device.
Claims20
A residual-current circuit breaker, comprising:
- a summation current transformer having a core, a first secondary winding wound onto the core, and at least one second secondary winding wound onto the core, with lines of an electric network to be protected extending through the core;
- break contacts;
- a tripping apparatus operably connected to the break contacts for opening the break contacts;
- a first arrangement for detecting alternating residual currents, said first arrangement connected to the first secondary winding;
- a second arrangement for detecting direct residual currents, said second arrangement being connected to the second secondary winding;
- and
- a timer device controlling a predeterminable alternating operation of the first and second arrangements.
A method for detecting direct residual currents and alternating residual currents in a residual-current circuit breaker with a single summation current transformer, comprising the steps of:
- measuring alternating residual currents only in a first step in a first period of time;
- and
- measuring in a subsequent second step direct residual currents only in a second period of time.
Dependencies are inferred from the claim text.