A detection device has a detecting port, a leakage port, an oscillation circuit and a detection circuit. The detecting port is used for pluggably coupled to an object. The leakage port is electrically coupled to a ground loop. The oscillation circuit is respectively coupled to the detecting port and the leakage port, and used for generating an oscillation signal. When the detecting port is coupled to the object, electrons on the object are transferred to the leakage port via the oscillation circuit. The detection circuit is used for determining whether the detecting port is coupled to the object based on the oscillation characteristic of the oscillation signal.

A detection device has a detecting port, a leakage port, an oscillation circuit and a detection circuit. The detecting port is used for pluggably coupled to an object. The leakage port is electrically coupled to a ground loop. The oscillation circuit is respectively coupled to the detecting port and the leakage port, and used for generating an oscillation signal. When the detecting port is coupled to the object, electrons on the object are transferred to the leakage port via the oscillation circuit. The detection circuit is used for determining whether the detecting port is coupled to the object based on the oscillation characteristic of the oscillation signal.

A fracturing well site system includes an electric-driven apparatus, a fuel-driven apparatus, an electric-power supply apparatus and a grounding system. The grounding system includes a first grounding terminal which is spaced from each of the electric-driven apparatus, the fuel-driven apparatus and the electric-power supply apparatus by a preset distance. The fuel-driven apparatus and at least one of the electric-driven apparatus and the electric-power supply apparatus are connected to the first grounding terminal, and the first grounding terminal is configured to ground the fuel-driven apparatus and the at least one of the electric-driven apparatus and the electric-power supply apparatus.

A fracturing well site system includes an electric-driven apparatus, a fuel-driven apparatus, an electric-power supply apparatus and a grounding system. The grounding system includes a first grounding terminal which is spaced from each of the electric-driven apparatus, the fuel-driven apparatus and the electric-power supply apparatus by a preset distance. The fuel-driven apparatus and at least one of the electric-driven apparatus and the electric-power supply apparatus are connected to the first grounding terminal, and the first grounding terminal is configured to ground the fuel-driven apparatus and the at least one of the electric-driven apparatus and the electric-power supply apparatus.

The described devices, “grounded [ungrounded] stimulation devices” and “devices with [without] EMF removal”, assist in maintaining and/or restoring bodily health primarily via two modes of operation: In one set of embodiments, by reducing or removing the effects of electromagnetic fields (EMFs) encountered in daily life, through grounding. In another set of embodiments, by stimulating and/or encouraging bodily healing processes through the supply of free electrons, at Schumann frequencies. The embodiments function by allowing or increasing, respectively, the flow of low-current, low-voltage current into or out of the body, at levels safe for humans and animals, through conductive materials in electrical contact with the body. These devices use conductive materials incorporated into and/or comprising handheld, wearable or other items that directly contact the body, including shavers, clothing, shoes, mousepads, footstools, bedding, jewelry and collars. Certain devices allow the addition of heat/cold.

The described devices, “grounded [ungrounded] stimulation devices” and “devices with [without] EMF removal”, assist in maintaining and/or restoring bodily health primarily via two modes of operation: In one set of embodiments, by reducing or removing the effects of electromagnetic fields (EMFs) encountered in daily life, through grounding. In another set of embodiments, by stimulating and/or encouraging bodily healing processes through the supply of free electrons, at Schumann frequencies. The embodiments function by allowing or increasing, respectively, the flow of low-current, low-voltage current into or out of the body, at levels safe for humans and animals, through conductive materials in electrical contact with the body. These devices use conductive materials incorporated into and/or comprising handheld, wearable or other items that directly contact the body, including shavers, clothing, shoes, mousepads, footstools, bedding, jewelry and collars. Certain devices allow the addition of heat/cold.

A swivel joint includes a tail section and a body portion that define a passageway therethrough and which can rotate relative to one another. One or more seals and bearings can be disposed between the tail section and the body portion. An electrical conductivity grease fitting can be mounted within a bore hole in the body portion. The electrical conductivity grease fitting can have a lubricant passed therethrough to lubricate the bearings. The electrical conductivity grease fitting has a first portion in electrical communication with the body portion and a second portion that is biased into electrical communication with the tail section to maintain electrical conductivity between the tail section and the body portion.

A swivel joint includes a tail section and a body portion that define a passageway therethrough and which can rotate relative to one another. One or more seals and bearings can be disposed between the tail section and the body portion. An electrical conductivity grease fitting can be mounted within a bore hole in the body portion. The electrical conductivity grease fitting can have a lubricant passed therethrough to lubricate the bearings. The electrical conductivity grease fitting has a first portion in electrical communication with the body portion and a second portion that is biased into electrical communication with the tail section to maintain electrical conductivity between the tail section and the body portion.

A discharge device for discharging electrostatic charges from a shaft includes a frame support having a first leg and a second leg and a contact strand for forming a contact surface with the shaft, a first end of the contact strand being clamped on the first leg and a second end of the contact strand being mounted so as to be displaceable on the second leg, a receiving means which is disposed on the frame support, the second end of the contact strand extending at least partly into the receiving means, and a switch, in particular a reed switch, which is disposed in the receiving means or in the contact strand and which is configured so as to be activated as a result of a displacement of the second end of the contact strand, said second end extending at least partly into the receiving means.

A discharge device for discharging electrostatic charges from a shaft includes a frame support having a first leg and a second leg and a contact strand for forming a contact surface with the shaft, a first end of the contact strand being clamped on the first leg and a second end of the contact strand being mounted so as to be displaceable on the second leg, a receiving means which is disposed on the frame support, the second end of the contact strand extending at least partly into the receiving means, and a switch, in particular a reed switch, which is disposed in the receiving means or in the contact strand and which is configured so as to be activated as a result of a displacement of the second end of the contact strand, said second end extending at least partly into the receiving means.