Provided is a technology for improving high-frequency characteristics in an electrical connector such as a BNC coaxial connector. An electrical connector according to the present disclosure includes: a cylindrical outer conductor; a center terminal located on a central axis of the outer conductor along an axial direction of the central axis; an insulator located coaxially between the outer conductor and the center terminal; and a band-shaped C-ring located inside the outer conductor. The outer conductor includes a housing groove for housing the C-ring, the housing groove being formed on an inner peripheral surface of the outer conductor on a front end side of the center terminal, and the housing groove includes a slope of which inner diameter is smaller on a front end side than on a rear end side, the slope being formed on a front end portion of the housing groove. An end surface on a front end side of the C-ring is corrugated.

An apparatus for isolating a malfunctioning network protector from the power distribution network and for allowing the network protector to be safely reset. The apparatus includes: a 3 phase controller coupled by parallel single phase poles in plural contactors to the fuse link and adapted to receive an electric load current flowing in reverse through the network power transformer; a remote controlled switch coupled to the controller for switching the electric load current from the network protector via the controller to the network bus, with the controller then carrying the electric load current in parallel with the network protector fuse link; and visual indicators coupled to the controller for showing when the remote controlled switch has been activated to transfer the load current from the fuse links to the controller and when the electric load current has been transferred from the controller to the network bus.

A rechargeable battery jump starting device having detachable positive and negative cables. The rechargeable battery jump starting device, including a rechargeable battery connected to a positive cam-lock cable connecting device and a negative cam-lock cable connecting device. The rechargeable battery jump starting device can include a highly electrically conductive frame connecting the rechargeable battery to the cam-lock cable devices.

A multimedia intelligent cleaning system and a control method thereof may include a self-propelled cleaning robot for cleaning a working surface and a safety guard device for connection with the self-propelled cleaning robot. The self-propelled cleaning robot and the safety guard device are detachably connected with each other through a securing assembly. The securing assembly has a first state in which the safety guard device is connected with the self-propelled cleaning robot and a second state in which the safety guard device is separated from the self-propelled cleaning robot. The multimedia intelligent cleaning system further comprises a detection assembly for detecting whether the securing assembly is in the first state or the second state, and a control unit for controlling whether the self-propelled cleaning robot enters a safe activation state depending on a detection signal from the detection assembly.

A multimedia intelligent cleaning system and a control method thereof may include a self-propelled cleaning robot for cleaning a working surface and a safety guard device for connection with the self-propelled cleaning robot. The self-propelled cleaning robot and the safety guard device are detachably connected with each other through a securing assembly. The securing assembly has a first state in which the safety guard device is connected with the self-propelled cleaning robot and a second state in which the safety guard device is separated from the self-propelled cleaning robot. The multimedia intelligent cleaning system further comprises a detection assembly for detecting whether the securing assembly is in the first state or the second state, and a control unit for controlling whether the self-propelled cleaning robot enters a safe activation state depending on a detection signal from the detection assembly.

A quick connect plug for cables includes a connecting portion configured to connect a cable and a plug pin configured to form a plug-in connection with a socket. The plug pin is fixedly provided with a plug-in unit. A portion of the plug-in unit protruding out of an external annular surface of the plug pin forms a locking head matched with a socket slot. A gap is provided between a portion of the plug-in unit near the locking head and the plug pin, so as to enable the locking head to move along an axis direction of the plug pin, and the gap can limit the maximum displacement of the locking head. By providing a plug-in unit and a gap between the portion of the plug-in unit near the locking head and the plug pin, the plug-in unit is enabled to move, thus having certain elasticity.

A quick connect plug for cables includes a connecting portion configured to connect a cable and a plug pin configured to form a plug-in connection with a socket. The plug pin is fixedly provided with a plug-in unit. A portion of the plug-in unit protruding out of an external annular surface of the plug pin forms a locking head matched with a socket slot. A gap is provided between a portion of the plug-in unit near the locking head and the plug pin, so as to enable the locking head to move along an axis direction of the plug pin, and the gap can limit the maximum displacement of the locking head. By providing a plug-in unit and a gap between the portion of the plug-in unit near the locking head and the plug pin, the plug-in unit is enabled to move, thus having certain elasticity.

In an electric power distribution network power is provided via high voltage cables carrying large secondary distribution currents which are connected to various electrical components such as transformers and network protectors which detect and accommodate secondary network power flow and problems such as network component malfunctioning or failure, and dangerous operating conditions such as an out of phase current status within the three or four high voltage primary power conducting cables arranged in parallel to share the load. network protectors address, among other things, a voltage out of phase situation in the cables which can lead to dangerous interruption conditions and result in damage to, or destruction of, the power distribution network and safety to the general public. The present invention addresses the problems associated with a faulty or failed network protector which permits continuous reversal in the direction of power (current) flow. Isolation of the problem network protector is achieved by transferring its load to associated network protectors on the secondary network to allow for safe servicing, or removal and replacement, of the hung-up network protector. The inventive electric network protector protection system automatically accommodates either 120 volt or 277 volt network systems, and further contemplates an arrangement for safely and securely connecting the network protector isolator's bus bar to a temporary power cable connected to contactors which can isolate a defective network protector from its associated network transformer.

The present invention relates to a connector which is a component of a high-voltage power supply connecting device, and which is capable of being prevented from being easily separated inadvertently or by an inexpert operator to prevent the occurrence of an electric shock accident, is capable of preventing the occurrence of an electric arc or the like during separation of the connector to improve safety, is capable of being easily and stably fixed and mounted on a desired location in an installation path inside an electric equipment chamber of an electric car, has a simple structure, and is capable of improving workability of an operator; and the high-voltage power supply connecting device including the same.

The present invention relates to a connector which is a component of a high-voltage power supply connecting device, and which is capable of being prevented from being easily separated inadvertently or by an inexpert operator to prevent the occurrence of an electric shock accident, is capable of preventing the occurrence of an electric arc or the like during separation of the connector to improve safety, is capable of being easily and stably fixed and mounted on a desired location in an installation path inside an electric equipment chamber of an electric car, has a simple structure, and is capable of improving workability of an operator; and the high-voltage power supply connecting device including the same.