Circuit breaker state detector, and low-voltage electrical system including circuit breaker state detector

A circuit breaker state detector for determining a state of a circuit breaker, the circuit breaker connected between an input supply line and an output supply line of a low-voltage electrical system, the circuit breaker state detector comprising a test signal transceiver and a test signal evaluator,

• wherein the test signal transceiver comprises a first transceiver section being capacitively or inductively coupled, at a first coupling point, with the input supply line, and a second transceiver section being inductively coupled, at a second coupling point, with the input supply line or the output supply line,
• wherein one of the first transceiver section and the second transceiver section is a test signal transmitter configured to generate an AC test signal and inject the test signal into the input or output supply line,
• wherein the other one of the first transceiver section and the second transceiver section is a test signal receiver configured to receive the test signal from the input or output supply line,
• wherein the test signal evaluator is connected to the test signal transceiver and configured to determine the state of the circuit breaker from the received test signal,
• wherein the test signal receiver comprises a test signal reception stage and at least one multiplexer having an input terminal coupled with an output terminal of the test signal reception stage and having output terminals coupled with a filter stage,
• wherein the test signal reception stage is configured to receive the test signal and output a first derived signal and a second derived signal of the test signal at the output terminal, the first and second derived signals being approximately 180° phase shifted to each other, and
• wherein the at least one multiplexer is configured to output the respective first and second derived signals multiplied by a square wave having a frequency of about a frequency of the test signal.

A circuit breaker state detector for determining a state of a circuit breaker, the circuit breaker connected between an input supply line and an output supply line of a low-voltage electrical system, the circuit breaker state detector comprising a test signal transceiver and a test signal evaluator,

• wherein the test signal transceiver comprises a first transceiver section being capacitively or inductively coupled, at a first coupling point, with the input supply line, and a second transceiver section being inductively coupled, at a second coupling point, with the input supply line or the output supply line,
• wherein one of the first transceiver section and the second transceiver section is a test signal transmitter configured to generate an AC test signal and inject the test signal into the input or output supply line,
• wherein the other one of the first transceiver section and the second transceiver section is a test signal receiver configured to receive the test signal from the input or output supply line,
• wherein the test signal evaluator is connected to the test signal transceiver and configured to determine the state of the circuit breaker from the received test signal,
• wherein the test signal transceiver further comprises a test signal reception stage and at least one multiplexer having an input terminal coupled with an output terminal of the test signal reception stage and having output terminals coupled with a filter stage, and
• wherein the test signal reception stage is configured to receive the test signal and output a first derived signal and a second derived signal of the test signal at the output terminal.

A circuit breaker state detector for determining a state of a circuit breaker, the circuit breaker connected between an input supply line and an output supply line of a low-voltage electrical system, the circuit breaker state detector comprising a test signal transceiver and a test signal evaluator,

• wherein the test signal transceiver comprises a first transceiver section being capacitively or inductively coupled, at a first point, with the input supply line, and at least two second transceiver sections each inductively coupled with a different input supply line,
• wherein both the first coupling point and the second coupling point are located along the input supply line,
• wherein one of the first transceiver section and the second transceiver section is a test signal transmitter configured to generate an alternating current (AC) test signal and inject the test signal into the input supply line,
• wherein the other one of the first transceiver section and the second transceiver section is a test signal receiver configured to receive the test signal from the input supply line,
• wherein the test signal evaluator is connected to the test signal transceiver and configured to determine the state of the circuit breaker from the received test signal, and
• wherein each second transceiver section receives the test signal as a line attributed test signal from the respective input or output supply line.