Residual current circuit breaker

Patent metadata

Field	Value
Publication number	US-10056212-B2
Application number	US-201414892202-A
Country	US
Kind code	B2
Filing date	May 23, 2014
Priority date	May 23, 2013
Publication date	Aug 21, 2018
Grant date	Aug 21, 2018

Abstract

A residual current circuit breaker has a summation current transformer that has primary windings as well as a secondary and a tertiary winding, the secondary winding forming a circuit with an electronic trigger unit that is independent of the network voltage, and the tertiary winding forming a circuit with an electronic trigger unit that is dependent on the network voltage. The residual current circuit breaker may have an electronic control unit designed to actuate a switch upon predefinable actuation by the network voltage-dependent electronic trigger unit, and the switch, when in the actuated state, may interrupt contact of the secondary winding with the network voltage-independent electronic trigger unit and establishes contact of the tertiary winding with the network voltage-dependent electronic trigger unit.

First claim

The invention claimed is:

1. A residual current circuit breaker, comprising:
a differential current transformer including primary windings, a secondary winding, and a tertiary winding; and
a control electronic system,
wherein the secondary winding is connected by circuitry to a first trip electronic system, which is independent of the mains voltage,
wherein the tertiary winding is connected by circuitry to a second trip electronic system, which is dependent on the mains voltage,
wherein the control electronic system, when predeterminably actuated by the second trip electronic system, is configured to actuate a switch, and
wherein, when actuated, the switch breaks a first contact between the secondary winding and the first trip electronic system and establishes a second contact between the tertiary winding and the second trip electronic system.

2. The breaker of claim 1 , wherein the switch is configured as a solid-state relay.

3. The breaker of claim 1 , wherein the switch is configured as a photo-MOS relay.

4. The breaker of claim 1 , wherein the second trip electronic system includes a digital signal processing unit,
wherein the digital signal processing unit is configured to issue a predeterminably changing control signal to a control input of the control electronic system, and
wherein the control electronic system is configured to actuate the switch when the predeterminably changing control signal is applied to the control input.

5. The breaker of claim 1 , wherein the second trip electronic system includes a digital signal processing unit.

6. The breaker of claim 1 , wherein the second trip electronic system includes a digital signal processing unit configured to issue a predeterminably changing control signal to a control input of the control electronic system.

7. The breaker of claim 1 , wherein the control electronic system configured to actuate the switch when a predeterminably changing control signal is applied to the control input.

8. The breaker of claim 2 , wherein the second trip electronic system includes a digital signal processing unit,
wherein the digital signal processing unit is configured to issue a predeterminably changing control signal to a control input of the control electronic system, and
wherein the control electronic system is configured to actuate the switch when the predeterminably changing control signal is applied to the control input.

9. The breaker of claim 3 , wherein the second trip electronic system includes a digital signal processing unit,
wherein the digital signal processing unit is configured to issue a predeterminably changing control signal to a control input of the control electronic system, and
wherein the control electronic system is configured to actuate the switch when the predeterminably changing control signal is applied to the control input.

Assignees

• Eaton Ind Austria Gmbh
• Eaton Intelligent Power Ltd

Inventors

• Ritzinger Georg

Classifications

• H02H3/332

  with means responsive to DC component in the fault current · CPC title

• H02H3/05

  with means for increasing reliability, e.g. redundancy arrangements {(for logic circuits H03K19/003)} · CPC title

• H02H3/044

  Checking correct functioning of protective arrangements, e.g. by simulating a fault (for differential current circuit breakers H02H3/335) · CPC title

• H01H83/02 Primary

  operated by earth fault currents (H01H83/14 takes precedence) · CPC title

• H01H47/007 Primary

  with galvanic isolation between controlling and controlled circuit, e.g. transformer relay · CPC title