Abstract: An electricity meter for metering an amount of energy in accordance with a primary AC current and an AC supply voltage. The electricity meter comprises a current transformer comprising the primary conductor, a secondary winding, an auxiliary winding, and a magnetic core arranged to be magnetically coupled with the three windings. The electricity meter further comprises a circuit configured to provide the auxiliary winding with a test signal modulated in accordance with at least one of a first and a second modulation state. The test signal has the same frequency as the AC supply voltage.

Abstract: An electricity meter for metering an amount of energy in accordance with a primary AC current and an AC supply voltage. The electricity meter comprises a current transformer comprising the primary conductor, a secondary winding, an auxiliary winding, and a magnetic core arranged to be magnetically coupled with the three windings. The electricity meter further comprises a circuit configured to provide the auxiliary winding with a test signal modulated in accordance with at least one of a first and a second modulation state. The test signal has the same frequency as the AC supply voltage.

Abstract: The technology relates to detecting the wiring phase of an unknown phase voltage relative to a reference phase voltage in an electric power distribution system having a polyphase power line. In order to reliably detect the wiring phase at the remote location relative to a reference wiring phase even if the remote location is at a larger distance from the reference location, at least one relay location is arranged between the reference location and the remote location and connected to the wiring phase of the polyphase power line. A first phase relation is detected between the reference wiring phase voltage at the reference location and the wiring phase voltage at the relay location. A second phase relation is detected between the wiring phase voltage at the relay location and the wiring phase voltage at the remote location. The wiring phase of the remote location relative to the wiring phase at the reference location is detected based on the first phase relation and the second phase relation.

Abstract: An electric circuit breaker apparatus protects an electrical circuit against excessive current loads. A first remotely programmable circuit breaker trip device receives an external command with a programmable current threshold, detects a current level in the electrical circuit, and may cause a break in the electrical circuit depending on the detected current level in accordance with a first current duration associated with the stored programmable current threshold. A second electrical circuit breaker trip device is arranged to cause a break in the electrical circuit in accordance with a second current duration different, e.g., shorter, than the first current duration if a current flowing in the electrical circuit exceeds a predetermined rated current for more than the second current duration.

Abstract: A device for detecting a fault of at least one street lamp of a plurality of street lamps which are connectable in common to an AC power supply is proposed. The proposed device allows detecting whether a fault has occurred based on obtaining measures representative of the total active and reactive power supplied by the AC power supply to the plurality of street lamps, and detecting variations in these measures. Optionally, also the type of fault can be determined based on detected variations in the power measures.

Abstract: The technology relates to detecting the wiring phase of an unknown phase voltage relative to a reference phase voltage in an electric power distribution system having a polyphase power line. In order to reliably detect the wiring phase at the remote location relative to a reference wiring phase even if the remote location is at a larger distance from the reference location, at least one relay location is arranged between the reference location and the remote location and connected to the wiring phase of the polyphase power line. A first phase relation is detected between the reference wiring phase voltage at the reference location and the wiring phase voltage at the relay location. A second phase relation is detected between the wiring phase voltage at the relay location and the wiring phase voltage at the remote location. The wiring phase of the remote location relative to the wiring phase at the reference location is detected based on the first phase relation and the second phase relation.

Abstract: The technology relates to detecting the wiring phase of an unknown phase voltage relative to a reference phase voltage in an electric power distribution system having a polyphase power line. In order to reliably detect the wiring phase at the remote location relative to a reference wiring phase even if the remote location is at a larger distance from the reference location, at least one relay location is arranged between the reference location and the remote location and connected to the wiring phase of the polyphase power line. A first phase relation is detected between the reference wiring phase voltage at the reference location and the wiring phase voltage at the relay location. A second phase relation is detected between the wiring phase voltage at the relay location and the wiring phase voltage at the remote location. The wiring phase of the remote location relative to the wiring phase at the reference location is detected based on the first phase relation and the second phase relation.

Abstract: A device for detecting a fault of at least one street lamp of a plurality of street lamps which are connectable in common to an AC power supply is proposed. The proposed device allows detecting whether a fault has occurred based on obtaining measures representative of the total active and reactive power supplied by the AC power supply to the plurality of street lamps, and detecting variations in these measures. Optionally, also the type of fault can be determined based on detected variations in the power measures.

Abstract: Control meter for controlling the supply of services, in particular the supply of electric energy, having a support base, anchored with which is a main power supply line, and a metering group detachable from the support base and with a measurement apparatus interposed between the main power supply line and a subscriber line. A safety anchorage is provided for preventing fraudulent manipulations at the control meter and comprises mechanical means associated with the metering group and movable into a locking position for engagement with the support base when the metering group is mounted on the support base, and an interrupter for generating an activation signal upon activation by the mechanical means, wherein the mechanical means is arranged to activate the interrupter when the mechanical means is released from the locking position for detaching the metering group from the support base.

Abstract: A system detects the wiring phase of an unknown phase voltage at a remote location relative to a reference phase voltage at a reference location in an electrical power distribution system having a single phase or poly phase power line. A transmitter transmits a signal from the reference location to the remote location. The signal comprises a characteristic signal pattern. Moreover, a first circuit detects at the remote location the characteristic signal pattern of the signal and determines a first time interval between the characteristic signal pattern and the occurrence of a reference point in the unknown phase voltage. A second circuit determines at the reference location a second time interval between the characteristic signal pattern and the occurrence of a reference point in the reference phase voltage. The system determines the wiring phase of the unknown phase voltage from the first time interval and the second time interval.

Abstract: An electric circuit breaker apparatus protects an electrical circuit against excessive current loads. A first remotely programmable circuit breaker trip device receives an external command with a programmable current threshold, detects a current level in the electrical circuit, and may cause a break in the electrical circuit depending on the detected current level in accordance with a first current duration associated with the stored programmable current threshold. A second electrical circuit breaker trip device is arranged to cause a break in the electrical circuit in accordance with a second current duration different, e.g., shorter, than the first current duration if a current flowing in the electrical circuit exceeds a predetermined rated current for more than the second current duration.

Abstract: An electric circuit breaker comprises a switch to be arranged in the electrical circuit. The switch breaks the electrical circuit in response to a tripping signal. A programmable current threshold command is received and stored. A current level in the electrical circuit is detected, and a processor generates the tripping signal tripping signal depending on the stored programmable current threshold command and the detected current level.

Abstract: Control meter for controlling the supply of services, in particular the supply of electric energy, having a support base, anchored with which is a main power supply line, and a metering group detachable from the support base and with a measurement apparatus interposed between the main power supply line and a subscriber line. A safety anchorage is provided for preventing fraudulent manipulations at the control meter and comprises mechanical means associated with the metering group and movable into a locking position for engagement with the support base when the metering group is mounted on the support base, and an interrupter for generating an activation signal upon activation by the mechanical means, wherein the mechanical means is arranged to activate the interrupter when the mechanical means is released from the locking position for detaching the metering group from the support base.

Abstract: The present invention relates to detecting the wiring phase of an unknown phase voltage relative to a reference phase voltage in an electric power distribution system having a polyphase power line. In order to reliably detect the wiring phase at the remote location relative to a reference wiring phase even if the remote location is at a larger distance from the reference location, at least one relay location is arranged between the reference location and the remote location and connected to the wiring phase of the polyphase power line. A first phase relation is detected between the reference wiring phase voltage at the reference location and the wiring phase voltage at the relay location. A second phase relation is detected between the wiring phase voltage at the relay location and the wiring phase voltage at the remote location. The wiring phase of the remote location relative to the wiring phase at the reference location is detected based on the first phase relation and the second phase relation.

Abstract: A system for detecting the wiring phase of an unknown phase voltage at a remote location (200) relative to a reference phase voltage (R) at a reference location (100) in an electrical power distribution system having a single phase or poly phase power line (L), comprises a circuit (1, 3, 32) for transmitting a signal (C1) from the reference location (100) to said remote location (200), the signal comprising a characteristic signal pattern (DEL). Moreover, a circuit is provided for detecting at said remote location the characteristic signal pattern (DEL) of the signal (C1) and for determining a first time interval (T1) between the characteristic signal pattern and the occurrence of a reference point (S+) in the unknown phase voltage. A circuit (2, 5 to 9) is provided for determining at said reference location (100) a second time interval (T2) between the characteristic signal pattern and the occurrence of a reference point (R+) in the reference phase voltage (R).

Abstract: An electric circuit breaker (1) comprises a switch (11) to be arranged in said electrical circuit (3); means (13) for causing said switch (11) to break said electrical circuit (3) in response to a tripping signal (14); means (17) for receiving (IF) and storing (MEM) a programmable current threshold command (CC); means (15) for detecting a current level (CL) in said electrical circuit (3); and processing means (16) for generating said tripping signal (14) depending on said stored programmable current threshold command (CC) and said detected current level (CL).