A sensor system includes a sensor network comprising at least one optical fiber having one or more optical sensors. At least one of the optical sensors is arranged to sense vibration of an electrical device and to produce a time variation in light output in response to the vibration. A detector generates an electrical time domain signal in response to the time variation in light output. An analyzer acquires a snapshot frequency component signal which comprises one or more time varying signals of frequency components of the time domain signal over a data acquisition time period. The analyzer detects a condition of the electrical device based on the snapshot frequency component signal.

A sensor system includes a sensor network comprising at least one optical fiber having one or more optical sensors. At least one of the optical sensors is arranged to sense vibration of an electrical device and to produce a time variation in light output in response to the vibration. A detector generates an electrical time domain signal in response to the time variation in light output. An analyzer acquires a snapshot frequency component signal which comprises one or more time varying signals of frequency components of the time domain signal over a data acquisition time period. The analyzer detects a condition of the electrical device based on the snapshot frequency component signal.

A monitoring system, method, and device for sealing electrical equipment (10) and electrical equipment (10) with monitored sealing, including at least one sensor set (100), at least one signaling system (15) and at least one drying system (300), wherein the sensor set (100) includes at least one moisture sensor (20) and at least one liquid presence sensor (25) connected to at least one centralizing element (30), wherein the centralizing element (30) is configured to receive data from at least the sensors and generate outputs corresponding thereto, defining the type of liquid in contact with a sensor, assessing the integrity of the sealing system, and detecting the loss of efficiency of the drying system (300). The system may be configured to detect trends and automatically generate alarms and recommendations, mitigating the from inspections of sealing systems on electrical equipment (10) while enhancing the reliability of the operation, lowering costs and enhancing safety and security.

A breather device (1) for dehumidifying air to be supplied into an expansion vessel (103) of a power electrical device (100), said breather device comprising an air demoisturizer unit (2) including one or more tanks (21), each tank having an internal volume (20) accommodating a regenerable moisture absorbing substance and a heater (23) for regenerating said moisture absorbing substance, at least a first opening (25) configured to put the internal volume of said tank in fluid-dynamic communication with the external environment and at least a second opening (22) configured to allow a flow of air to exit from the internal volume of said tank towards another section of said breather device.

Each tank (21) comprises at least a third opening (24) in fluid-dynamic communication with the external environment and valve means (26) operatively associated to said third opening, said valve means (26) being configured to automatically allow or prevent a flow of air to pass through said third opening, depending on the internal temperature of said tank.

Techniques for assessing a health of a transformer breather are provided. The transformer breather contains a desiccant and is in fluid communication with an expansion tank of a fluid-insulated transformer. A weight measurement that is dependent on a weight of the transformer breather or of a component or sub-assembly thereof is processed to assess the health of the transformer breather.

A rupture reduction system for fluid-immersed electrical equipment includes a turret for mounting of a bushing. The turret is expandable in volume in response to a surge in pressure of the fluid in the turret. The expansion volume can be provided by an expandable section of the turret, which may include a bellows.

A rupture reduction system for fluid-immersed electrical equipment includes a turret for mounting of a bushing. The turret is expandable in volume in response to a surge in pressure of the fluid in the turret. The expansion volume can be provided by an expandable section of the turret, which may include a bellows.

Disclosed are a defect monitoring apparatus and detection method for a transformer oil conservator based on edge computing. The monitoring apparatus includes: a sensing terminal, an edge intelligent gateway, a monitoring terminal, an oil conservator defect monitoring cloud platform, and a client terminal. The edge intelligent gateway and the monitoring terminal are both disposed in a substation. The monitoring terminal is configured to access the edge intelligent gateway. The sensing terminal includes: an airflow sensor, an oil temperature sensor, an ambient temperature sensor, and a microwave oil level measurement assembly. The sensing terminal sends detection data information to the edge intelligent gateway, and the edge intelligent gateway stores and determines a category of the detection data information. The present disclosure can recognize capsule damage, partial blockage of a breathing circuit, leakage in the breathing circuit, moisture impurities in a breathing tube, and false oil level.

Disclosed are a defect monitoring apparatus and detection method for a transformer oil conservator based on edge computing. The monitoring apparatus includes: a sensing terminal, an edge intelligent gateway, a monitoring terminal, an oil conservator defect monitoring cloud platform, and a client terminal. The edge intelligent gateway and the monitoring terminal are both disposed in a substation. The monitoring terminal is configured to access the edge intelligent gateway. The sensing terminal includes: an airflow sensor, an oil temperature sensor, an ambient temperature sensor, and a microwave oil level measurement assembly. The sensing terminal sends detection data information to the edge intelligent gateway, and the edge intelligent gateway stores and determines a category of the detection data information. The present disclosure can recognize capsule damage, partial blockage of a breathing circuit, leakage in the breathing circuit, moisture impurities in a breathing tube, and false oil level.

A pressure compensator for providing pressure compensation for a chamber of a subsea device is provided. The pressure compensator has an enclosure with at least an outer wall. A first compensation chamber is provided inside the enclosure. A flow connection from the first compensation chamber towards the chamber of the subsea device is further provided. As second compensation chamber is provided inside the enclosure. First and second separating walls are arranged inside the enclosure. A first bellows portion of the first separating wall and a second bellows portion of the second separating wall are deformable to provide pressure compensation between the chamber of the subsea device and a second inner volume around which the second separating wall extends.