A detection device to detect an operating condition of air-drying salts contained in a breather for power transformers operatively coupleable to the breather is described. The detection device comprises illumination means comprising at least a light source adapted to illuminate airdrying salts contained in the breather with a first light radiation. The detection device also comprises acquisition means comprising at least a light sensor adapted to receive a second light radiation coming from air-drying salts contained in the breather. The acquisition means is configured to provide first detection signals indicative of the color of the second light radiation. The detection device further comprises a control unit for controlling operation of the detection device. The control unit is configured to receive and process the first detection signals.

The present application relates to a flexible bag for an oil expansion tank of a transformer, an oil expansion tank comprising the flexible bag and a transformer comprising the oil expansion tank comprising the flexible bag. Further, the present application relates to a method for producing the flexible bag and use of the flexible bag in an oil expansion tank of a transformer. In particular, the present application relates to an flexible bag for an oil expansion tank of a transformer, comprising a first and a second elastomer layer, and a reinforcement layer comprising a fabric, the reinforcement layer arranged between the first elastomer layer and the second elastomer layer; and the first and the second elastomer layers comprising each at least one elastomer selected from at least one of vulcanized nitrile butadiene rubber, vulcanized hydrogenated nitrile butadiene rubber or vulcanized epichlorohydrin rubber.

The present application relates to a flexible bag for an oil expansion tank of a transformer, an oil expansion tank comprising the flexible bag and a transformer comprising the oil expansion tank comprising the flexible bag. Further, the present application relates to a method for producing the flexible bag and use of the flexible bag in an oil expansion tank of a transformer. In particular, the present application relates to an flexible bag for an oil expansion tank of a transformer, comprising a first and a second elastomer layer, and a reinforcement layer comprising a fabric, the reinforcement layer arranged between the first elastomer layer and the second elastomer layer; and the first and the second elastomer layers comprising each at least one elastomer selected from at least one of vulcanized nitrile butadiene rubber, vulcanized hydrogenated nitrile butadiene rubber or vulcanized epichlorohydrin rubber.

A prefabricated transformer station, an oil-immersed transformer, and a photovoltaic system, and relates to the field of power distribution technologies. The prefabricated transformer station includes a container housing and the oil-immersed transformer. A transformer room is provided inside the container housing, and a top cover of the transformer room is opened. The oil-immersed transformer is installed in the transformer room, and a height of a top of an oil conservator of the oil-immersed transformer is higher than a height of a side wall of the transformer room. The prefabricated transformer station can provide more space for a fuel tank, so as to improve a capacity of the oil-immersed transformer.

A prefabricated transformer station, an oil-immersed transformer, and a photovoltaic system, and relates to the field of power distribution technologies. The prefabricated transformer station includes a container housing and the oil-immersed transformer. A transformer room is provided inside the container housing, and a top cover of the transformer room is opened. The oil-immersed transformer is installed in the transformer room, and a height of a top of an oil conservator of the oil-immersed transformer is higher than a height of a side wall of the transformer room. The prefabricated transformer station can provide more space for a fuel tank, so as to improve a capacity of the oil-immersed transformer.

The disclosure includes embodiments of systems and methods for removing moisture from an electric power transformer. According to an embodiment, a moisture removal system includes a pump to move oil from the transformer into the system; one or more incoming oil moisture and temperature sensors to detect a first moisture level and temperature of oil; a processor to receive the moisture and temperature and determine an estimated paper moisture value of the insulation of the transformer, and compare the estimate to a target paper moisture value; and an overdry prevention bypass valve positioned in a first position to divert oil without drying when the estimated paper moisture value is equal to or less than the target value, and in a second position to channel oil through one or more drying cylinders when the estimated paper moisture value exceeds the target value.

The disclosure includes embodiments of systems and methods for removing moisture from an electric power transformer. According to an embodiment, a moisture removal system includes a pump to move oil from the transformer into the system; one or more incoming oil moisture and temperature sensors to detect a first moisture level and temperature of oil; a processor to receive the moisture and temperature and determine an estimated paper moisture value of the insulation of the transformer, and compare the estimate to a target paper moisture value; and an overdry prevention bypass valve positioned in a first position to divert oil without drying when the estimated paper moisture value is equal to or less than the target value, and in a second position to channel oil through one or more drying cylinders when the estimated paper moisture value exceeds the target value.

Devices, systems, and methods for determining gas characteristics to monitor transformer operation include extracting gas from transformer fluid for analysis.

An enclosure (10) for a subsea control and power arrangement (12), the enclosure (10) comprises: a cannister (14) and a lid (16), a connector assembly (20), a first volume compensator (22) and a second volume compensator (30). The cannister (14) and the lid (16) form an enclosure volume (18). The first volume compensator (22) having a first chamber (23), the first volume compensator (22) is mounted to the enclosure (10) outside the enclosure volume (18). The first chamber (23) has a variable volume. The second volume compensator (30) having a second chamber (31). The second chamber (31) has a variable volume. The connector assembly (20) extends through the lid (16) and into the enclosure volume (18) and comprises a housing (24) forming a third chamber (26) and a connector part (28). The connector part (28) is mounted at least partly within the housing (24) and the housing (24) is located at least partly within the enclosure volume (18), the connector part (28) extends through the housing (24) and into the enclosure volume (18). The first chamber (23), the second chamber (31) and the third chamber (26) are liquidly connected to one another to form a compensator volume (23, 31, 26). The compensator volume (23, 31, 26) is arranged, in liquid flow order, between the enclosure volume (18) and ambient (54) the enclosure (10) thereby forming at least two sealing barriers between ambient (54) and the enclosure volume (18).

An enclosure (10) for a subsea control and power arrangement (12), the enclosure (10) comprises: a cannister (14) and a lid (16), a connector assembly (20), a first volume compensator (22) and a second volume compensator (30). The cannister (14) and the lid (16) form an enclosure volume (18). The first volume compensator (22) having a first chamber (23), the first volume compensator (22) is mounted to the enclosure (10) outside the enclosure volume (18). The first chamber (23) has a variable volume. The second volume compensator (30) having a second chamber (31). The second chamber (31) has a variable volume. The connector assembly (20) extends through the lid (16) and into the enclosure volume (18) and comprises a housing (24) forming a third chamber (26) and a connector part (28). The connector part (28) is mounted at least partly within the housing (24) and the housing (24) is located at least partly within the enclosure volume (18), the connector part (28) extends through the housing (24) and into the enclosure volume (18). The first chamber (23), the second chamber (31) and the third chamber (26) are liquidly connected to one another to form a compensator volume (23, 31, 26). The compensator volume (23, 31, 26) is arranged, in liquid flow order, between the enclosure volume (18) and ambient (54) the enclosure (10) thereby forming at least two sealing barriers between ambient (54) and the enclosure volume (18).