37results about How to "Reduce external electromagnetic interference" patented technology

The invention provides a coaxial cable power supply system of an electrified railway. The coaxial cable power supply system is composed of a center traction substation, coaxial cables, traction transformers, a contact system, a steel rail, circuit breakers and the like, wherein the center traction substation is connected with the coaxial cables; the coaxial cables are erected parallel with the contact system; the traction transformers are in single-phase connection, and are distributed along the coaxial cables and the contact system at certain intervals; a primary winding of each traction transformer is connected between an inner conductor and an outer conductor of the corresponding coaxial cable in parallel; a secondary winding of each traction transformer is connected between the contact system and the steel rail in parallel; the inner conductors of the coaxial cables are connected in parallel with the contact system by the adjacent traction transformers; the outer conductors of the coaxial cables are connected in parallel with the steel rail by the adjacent traction transformers. According to the coaxial cable power supply system, the power supply capacity and the voltage level are mainly determined by the coaxial cables; therefore the system is applicable for matching between the coaxial cables and various voltage grades of the contact system, and is beneficial to improving the light suspension and the overall quality of the contact system; the coaxial cables are erected along a railway or a subway tunnel without occupying additional corridors, so that interfaces between the railway and the public power grid can be reduced, the external power investment can be saved, and the management is facilitated.

The invention discloses a high-precision synchronous acquiring device. The high-precision synchronous acquiring device comprises a voltage transformer, a current transformer, a gear shifting control and signal conditioning module and an A / D chip, wherein the voltage transformer is used for sampling voltage signals before the device is connected to an electricity meter; the current transformer is used for sampling current signals before the device is connected to the electricity meter; the gear shifting control and signal conditioning module is used for automatic gain control, filtering and amplifying of the signals sampled by the voltage transformer and the current transformer; and the A / D chip is used for carrying out analog-digital conversion on the signals sampled by the voltage transformer and the current transformer and transmitting the converted digital signals to FPGA for processing. The signals acquired by the device have time mark information, synchronous high-precision acquisition of electric signals is realized, by the voltage transformer and the current transformer, sampling precision of the device is ensured, meanwhile, strong current is completely separated from weak current, electromagnetic interference of the outside is greatly reduced, and reliability and safety of the device are improved; and moreover, the information not only can be used on a foreground in real time, but also can be compressed and packed to be transmitted to a background for various application and analysis.

The present invention proposes a magnetic suction wire for storing VR glasses, including a glasses body, the glasses body is provided with a winding groove, a magnetic adsorption pad is provided at the bottom of the winding groove, and a VR wire is provided on the glasses body. The outer wall of the VR cable is spirally wound with a short-twist metal spring wire that is mutually adsorbed to the magnetic adsorption pad. The side of the glasses body is provided with a chute that runs through the winding groove. The slider is provided with a clamping positioning head, and the clamping positioning head is provided with a snap-in port for engaging the released VR line, and the side of the clamping positioning head facing the VR line in the unreleased state is provided with an unreleased VR line. The pressing port where the state VR line is against each other, and the thread management slider is provided with a clamping spring that pushes the line management slider towards the direction of the VR line in the unreleased state. The invention has the advantages of convenient carrying, convenient storage of wire rods, controllable release length of wire rods, effective prevention of wire rod knotting, high compressive strength of wire rods, softness and flexibility.