Disclosed herein is a system for detecting a partial discharge from electrical equipment. The system includes a vest dimensioned for wear by a user. An antenna is associated with the vest, and a receiver is coupled to the antenna and associated with the vest. At least one indicator device is associated with the best. Circuitry is associated with the vest and coupled to the receiver. The circuitry is configured to monitor ambient radiofrequency energy in real time, and determine that the partial discharge has occurred as a function of the ambient radiofrequency energy. The circuitry actuates the at least one indicator device as a function of the determination that the partial discharge has occurred, and transmits the determination that the partial charge has occurred to a control station via the wireless transmitter.

Disclosed herein is a system for detecting a partial discharge from electrical equipment. The system includes a vest dimensioned for wear by a user. An antenna is associated with the vest, and a receiver is coupled to the antenna and associated with the vest. At least one indicator device is associated with the best. Circuitry is associated with the vest and coupled to the receiver. The circuitry is configured to monitor ambient radiofrequency energy in real time, and determine that the partial discharge has occurred as a function of the ambient radiofrequency energy. The circuitry actuates the at least one indicator device as a function of the determination that the partial discharge has occurred, and transmits the determination that the partial charge has occurred to a control station via the wireless transmitter.

An assembled yarn comprises a first yarn and a second yarn. The first yarn comprises a core yarn and a first wrap yarn. The core yarn comprises a spun yarn, wherein the spun yarn comprises a blend of fibers, wherein the blend of fibers comprises first electrically conductive fibers. The first wrap yarn comprises or consists out of one or a plurality of metallic filaments. The first wrap yarn is wrapped around the core yarn with at least 300 turns per meter. The second yarn comprises second electrically conductive fibers. The second yarn is wrapped around the first yarn; or the second yarn is ply-twisted with the first yarn thereby forming a plied yarn. The assembled yarn can be used in electromagnetic shielding fabrics.

An assembled yarn comprises a first yarn and a second yarn. The first yarn comprises a core yarn and a first wrap yarn. The core yarn comprises a spun yarn, wherein the spun yarn comprises a blend of fibers, wherein the blend of fibers comprises first electrically conductive fibers. The first wrap yarn comprises or consists out of one or a plurality of metallic filaments. The first wrap yarn is wrapped around the core yarn with at least 300 turns per meter. The second yarn comprises second electrically conductive fibers. The second yarn is wrapped around the first yarn; or the second yarn is ply-twisted with the first yarn thereby forming a plied yarn. The assembled yarn can be used in electromagnetic shielding fabrics.

A fabric for arc-protective garments includes first yarns and second yarns different from the first yarns. The first yarns include first modacrylic fibers, and the first modacrylic fibers contain an infrared absorber in an amount of 2.5 wt % or more with respect to a total weight of the first modacrylic fibers. The weight of the infrared absorber per unit area in the fabric for arc-protective garments is 0.05 oz/yd.sup.2 or more. An arc-protective garment includes the fabric for arc-protective garments.

An electrically grounded clothing item includes: a grounding wire configured to provide electrical grounding; electrically conductive thread configured to ground the entire garment through the grounding wire; and a conducting connector to which the grounding wire can be electrically connected at a first grounding wire end, the conducting connector configured to hold the grounding wire tightly to the electrically grounded clothing item, the grounding wire electrically connected at a second grounding wire end to an electrical ground.

A yarn comprising a plurality of bicomponent filaments having a first region comprising a first polymer composition and a second region comprising a second polymer composition, each of the first and second regions being distinct in the bicomponent filaments; each bicomponent filament comprising 5 to 60 weight percent of the first polymer composition and 95 to 40 weight percent of the second polymer composition; wherein the first polymer composition comprises aramid polymer containing 0.5 to 20 weight percent discrete homogeneously dispersed carbon particles and the second polymer composition comprises modacrylic polymer being free of discrete carbon particles; the yarn having a total content of 0.1 to 5 weight percent discrete carbon particles.

A yarn comprising a plurality of bicomponent filaments having a first region comprising a first polymer composition and a second region comprising a second polymer composition, each of the first and second regions being distinct in the bicomponent filaments; each bicomponent filament comprising 5 to 60 weight percent of the first polymer composition and 95 to 40 weight percent of the second polymer composition; wherein the first polymer composition comprises aramid polymer containing 0.5 to 20 weight percent discrete homogeneously dispersed carbon particles and the second polymer composition comprises modacrylic polymer being free of discrete carbon particles; the yarn having a total content of 0.1 to 5 weight percent discrete carbon particles.

A wireless anti-static device is disclosed, including an electronic sensing circuit that measures the polarity and electrostatic potential of the subject relative to its surroundings. Ion guns of positive and negative polarities are able to transfer an arbitrary quantity and polarity of charge from the subject by ejecting ionized air molecules into the surrounding environment. A control unit is programmed to trigger the appropriate ion gun when a corresponding charge is measured on the body, in order to continually maintain the net charge on the body below a desired threshold. The subject is thus effectively grounded relative to its environment without requiring physical tethers to ground.

A wireless anti-static device is disclosed, including an electronic sensing circuit that measures the polarity and electrostatic potential of the subject relative to its surroundings. Ion guns of positive and negative polarities are able to transfer an arbitrary quantity and polarity of charge from the subject by ejecting ionized air molecules into the surrounding environment. A control unit is programmed to trigger the appropriate ion gun when a corresponding charge is measured on the body, in order to continually maintain the net charge on the body below a desired threshold. The subject is thus effectively grounded relative to its environment without requiring physical tethers to ground.