Abstract: The invention relates to a device for measuring temperature in a high-voltage portion of a switchgear station, characterised in that it comprises: at least one temperature sensor (21, 22, 23, 24) located at a point on the high-voltage portion of which the temperature is to be monitored, at least one antenna (25) connected to the at least one temperature sensor, a control module (26) located in a low-voltage portion of the switchgear station, and at least one antenna (27) connected to the control module. The at least one temperature sensor (21, 22, 23, 24) is suitable for transmitting a signal representative of a temperature measurement and the control module (26) is suitable for receiving the representative signal, via the antennas, and for processing said signal in order to produce a message.

Abstract: The invention relates to a device for measuring temperature in a high-voltage portion of a switchgear station, characterised in that it comprises: at least one temperature sensor (21, 22, 23, 24) located at a point on the high-voltage portion of which the temperature is to be monitored, at least one antenna (25) connected to the at least one temperature sensor, a control module (26) located in a low-voltage portion of the switchgear station, and at least one antenna (27) connected to the control module. The at least one temperature sensor (21, 22, 23, 24) is suitable for transmitting a signal representative of a temperature measurement and the control module (26) is suitable for receiving the representative signal, via the antennas, and for processing said signal in order to produce a message.

Abstract: A signal processor device comprising: first input means intended to be connected, via a measurement sensor, to a high-voltage signal of an electrical installation; and processor means for analyzing the signal measured by said sensor; the device further comprising: changeover means that are configured to cause the operation of the device to change between a test mode in which the device is disconnected from said high-voltage signal so as to be connected to a test signal, and an operating mode in which the device is disconnected from said test signal so as to be reconnected to said high-voltage signal; and second input means that are connected to said processor means, said processor means being configured to actuate said changeover means so that the device operates in test mode or in operating mode depending on whether the second input means are activated or de-activated respectively.

Abstract: A signal processor device comprising: first input means intended to be connected, via a measurement sensor, to a high-voltage signal of an electrical installation; and processor means for analyzing the signal measured by said sensor; the device further comprising: changeover means that are configured to cause the operation of the device to change between a test mode in which the device is disconnected from said high-voltage signal so as to be connected to a test signal, and an operating mode in which the device is disconnected from said test signal so as to be reconnected to said high-voltage signal; and second input means that are connected to said processor means, said processor means being configured to actuate said changeover means so that the device operates in test mode or in operating mode depending on whether the second input means are activated or de-activated respectively.

Abstract: A method of determining a leak rate of an insulating gas from a gas-insulated compartment of an electrical installation having a plurality of similar compartments, the method being characterized in that it comprises the steps of; periodically determining a gas density for each of the compartments; determining respective straight lines from series of gas densities for each of the compartments; comparing slopes of the determined lines with one another; detecting a leak if the result of a comparison for one of the slopes is greater than a threshold; and in the event of a leak being detected determining a leak rate for the compartment associated with the slope that lead to a leak being detected.

Abstract: A current sensor for measuring current through a conductor with the current sensor including a cable looped around the conductor to be monitored, and a transformer winding disposed in the cable for measuring current flow based on the Rogowski principle. The cable has opposite end portions coupled in an abutting relationship to form an endless loop with the winding flush with opposite end faces of the opposite and portions of the cable. The current sensor also has a coupling in the form of a sleeve including an assembly for attaching and detaching the opposite end positions of the cable having a stop ring which grips one of the end portions and a push button which is selectively movable against the stop ring for releasing the grip to open the opposite end portions. The cable may have a temperature sensor and a memory in which the measurement characteristics of the sensor are held. The sensor is reliable and accurate, and it can be left permanently in an electrical apparatus, or replaced, with no difficulty.

Abstract: A method of synchronizing an equipment unit (200) connected to a communications network (110), the equipment unit being connected to an electrical power supply network (120) providing at least one alternating current power supply voltage (121), the method including the steps of measuring a time difference between the power supply voltage and a synchronization voltage (131), computing a synchronization value, communicating the synchronization value to the equipment unit, the equipment unit detecting the power supply voltage passing through the given state, and synchronizing the equipment unit substantially simultaneously with detecting the supply voltage passing through the given state from the synchronization value. The invention also relates to a synchronization device (300) and a synchronization module (400) used in the synchronization method.

Abstract: The sensor comprises a cable (5) looped around an element to be monitored, and includes a winding (10) on the Rogowski principle. It is original in that it is open at its ends (6, 7), that is to say the winding (10) is flush with the end faces (25) of the cable (5), and perfect continuity of the winding and of measurement over a circumference is established by abutting the two ends together. This cable may have a temperature sensor and a memory in which the measurement characteristics of the sensor are held. The sensor is reliable and accurate, and it can be left permanently in an electrical apparatus, or replaced, with no difficulty.