33results about How to "Prevent Personal Electric Shock Accidents" patented technology

The invention relates to a mining flame-proof type selective leakage protector. The mining flame-proof type selective leakage protector is characterized in that the mining flame-proof type selective leakage protector comprises a single chip microcomputer, a power supply unit, a liquid crystal display module, a signal detecting and processing circuit, a communication module and a drive tripping circuit. The power supply unit is connected with the single chip microcomputer and the liquid crystal display module and supplies power for the single chip microcomputer and the liquid crystal display module, the single chip microcomputer is connected with a zero-sequence current mutual inductor arranged on a power supply system through the signal detecting and processing circuit to achieve an electric leakage detecting function, the single chip microcomputer is connected with a tripping executing mechanism on the power supply system through the drive tripping circuit to achieve a tripping control function, and the single chip microcomputer is connected with a remote monitoring host machine to achieve a remote monitoring function. The mining flame-proof type selective leakage protector is reasonable in design, achieves the function of classified selective electric leakage protection of a trunk line and a branch line of the power supply system with no neutral ground in an underground coal mine, improves the automation degree and the power supply quality of the coal mine, and better ensures personal safety and the safety of machinery equipment.

A distribution transformer prefabricated connection line with a closed insulating cover comprises a wire pole, the wire pole is provided with a drop-type switch, a lightning arrester and a transformer, the drop-type switch, the lightning arrester and the transformer are connected through a connection line body. The distribution transformer prefabricated connection line is characterized in that the connection line body comprises a main line copper tube, and a first plastic copper line penetrates into a main line copper tube, an electrical inspection grounding ring is connected with the side wall of the main line copper tube and comprises a grounding ring copper tube, the outer wall of the grounding ring copper tube and the outer wall of the main line copper tube are coated with a main line silicone rubber insulating layer, a bare electrical inspection grounding point is arranged on the lower portion of the electrical inspection grounding ring, one end of the first plastic copper line is connected with a first connection terminal which is connected with the drop-type switch, the outer wall of the portion, between the first connection terminal and the main line copper tube, of the first plastic copper line is coated with a first silicone rubber insulating layer, the other end of the first plastic copper line is connected with a second connection terminal which is connected with the transformer, the outer wall of the portion, between the second connection terminal and the main line copper tube, of the first plastic copper line is coated with a second silicone rubber insulating layer, the portion, located in the main line copper tube, of the first plastic copper line is a line core with a plastic wrapper stripped, the line core is connected with a core of a third plastic copper line, and the outer wall of the third plastic copper line is coated with a third silicone rubber insulating layer.

A high-voltage test alarm comprises an alarm starting return circuit and an alarm module. The alarm starting return circuit comprises a relay, a remote control module, a starting return circuit direct current power source and a relay normally open contact. A relay is connected between a control box of an alternating current withstand voltage instrument set device and a switch in parallel, wherein the switch is used for controlling a power source of the control box of an alternating current withstand voltage instrument. The starting return circuit direct current power source, and the relay normally open contact and the remoter control module are connected in series to form an electric return circuit. The alarm module is installed on a transformer voltage-sharing ball of the alternating current withstand voltage instrument set device by means of insulation process. The alarm module comprises a signal receiving module, an alarm direct current power source, a light alarm module and an audible alarm, wherein the light alarm module and the sound alarm module are connected with each other in parallel to form a parallel branch, and then the parallel branch is connected with the alarm direct current power source in series through the signal receiving module. The high-voltage test alarm is applicable to the field of electric power project (electric test) and capable of effectively avoiding occurrence of person electric shock accidents in the process of the high-voltage tests.

The invention discloses an automatic zero-off and zero-off protection device, which belongs to the technical field of electric power protection devices. Including the control part circuit and the detection part circuit, the control part circuit includes the auxiliary contact of the shunt circuit breaker and the relay; the detection part circuit includes the relay KC, the stop button SB1 of the shunt circuit breaker QF and the leakage protector RCD; it also includes The alarm part circuit is composed of the power supply E, the dynamic auxiliary contact QF3 of the shunt circuit breaker QF, the alarm R and the switch K, which are electrically connected in sequence. The invention is simple in structure, easy to use, strong in safety, high in intelligence, strong in versatility, low in cost, basically requires no maintenance, and is convenient to change or connect circuits on site; it is especially suitable for three-phase four-wire transformers and three-phase four-wire power supplies used on the device.

The invention provides a control system for an approaching-proof laser security scanning alarm of a high-rise electrified body of a transformer substation. The sensitivity of an alarm demanded by the design on the premise of reliably stabilizing operation is achieved through a main message loop broadcasting mechanism so that the technical design requirements of the alarm are finally met. According to the control system provided by the invention, the personal electric shock, which may be caused by a large-size construction machine in construction operation below the electrified body, can be solved, so that the heavy and large damages on the human body can be avoided; and the reliability of the operation process of a power grid is improved; and meanwhile, the fault of the power grid, which may be generated when the mechanical machine excessively approaches the electrified body, can be avoided.

The invention relates to a metallic inner-thread water pipe joint facilitating equipotential line connection. The metallic inner-thread water pipe joint comprises a water pipe joint, wherein a metallic internal-thread joint is arranged in the water pipe joint through integral injection molding, a metallic bump is integrally formed on the outer side surface of the metallic internal-thread joint, a tightening thread hole is formed in the outer end surface of the metallic bump in an axial direction, and a connection hole communicated with the inner end of the tightening thread hole is formed in the outer side surface of the metallic bump in a radial direction; during using, one end of a wire extends into the connection hole, the tightening wire is screwed into the tightening thread hole by a tightening screw, and the other end of the wire is connected with an equipotential device which is pre-embedded into the wall and is grounded. The connection structure is safe and reliable, the wire is not prone to falling off, and human body electric-shock safety accidents caused by electric leakage of an electric heater in a toilet, thunder and lightning, static electricity and the like are effectively prevented. The metallic inner-thread water pipe joint is firm in connection, safe, attractive, low in processing cost, easy to operate and suitable for being used on a plastic water pipe fitting.