31results about How to "Reduced residual pressure" patented technology

The invention discloses an SPD backup protection circuit breaker, which is used for the backup protection of the SPD. When the SPD is abnormal, it can provide inverse time protection and instantaneous protection, break the power frequency current, protect the SPD from damage or quickly separate it from the power supply circuit when the SPD is damaged, and provide preventive protection for SPD failure to avoid fire, etc. Disasters happen. The invention includes a shell, a handle, upper and lower terminals, an installation card, a tripping mechanism, a moving contact, a static contact, an arc extinguishing chamber, and also includes a discharge gap, a positive temperature coefficient resistor, a bimetal sheet and an electromagnetic tripping device . The invention can protect the SPD without affecting the function of the SPD to protect the protected equipment.

This invention relates to a method for producing insulated lightning protection of transmission and distribution line equipment. The invented method for producing explosion, lightning protection devices of unit combined serial gap voltage-sharing which includes its main body part and fixing sealed sheel. The main body part constitutes at least a set of discharging gap valves in effective discharging large panel porous ventilation type discharging gap valve plate clamping hollow insulation pads connected in series with at least a set of hollow ventilation metal zinc oxide composite stuck with insulated tubes and ventilation holes at the center adhered with ventilation insulating arc shield location disks around its waist, available in the production of lightning protection explosion proof insulators and explosion proof lightning arrestors.

The invention provides an intelligent identification method of 10kV line short-circuit fault voltage. The method is characterized in that a double-CPU feeder terminal formed by a main CPU and a detecting CPU is built, the residual voltage or instantaneous voltage during a 10kV line short-circuit fault is fast identified through the feeder terminal, a locking condition is provided for feeder terminal fault isolation, intelligent diagnosing can be performed and corresponding fault information can be provided when a 10kV power supply voltage transformer outside the feeder terminal and a related detecting loop fail, and a user can be timely reminded to turn on or turn off complete equipment to guarantee that the equipment is in a good operation state. By the intelligent identification method good in social benefit, local feeder automatic fault isolation and power restoration success rate increasing are benefited.

The invention provides a high-energy-capacity overvoltage absorber which relates to the technical field of electric power system overvoltage inhibition. The high-energy-capacity overvoltage absorber comprises non-linear resistors FR1 and FR2, a high-voltage fuse RD, a capacitor C and a resistor R. One end of the non-linear resistor FR2 serves as a port, and the other end is connected with one endof the resistor R, one end of the capacitor C and one end of the non-linear resistor FR1. The other end of the resistor R, the other end of the capacitor C and the other end of the non-linear resistors FR1 are respectively connected with one end of the high-voltage fuse RD. The other end of the high-voltage fuse RD serves as another port. The high-energy-capacity overvoltage absorber is good in voltage limiting effect, low in residual voltage value and good in energy gathering and energy absorbing.

The invention relates to a protective device of direct current power supple for communication equipment and belongs to the technical field of direct current power supply. The protective device comprises a lightning strike protection module, an over / under-voltage protection module, a wave filtering module and a DC-DC power supply module, wherein the lightning strike protection module comprises a primary protection unit, a display unit, a secondary protection unit and a protective tube FU2; the wave filtering module comprises a low-frequency wave filtering unit, a high-low frequency decoupling unit and a high-frequency wave filtering unit. In the invention, a comprehensive protection method based on the cooperation of the three modules, i.e., a reasonable design between two stages of lightning protection in which the first stage of lightning protection is used for aerial drainage and the second stage of lightning protection is used for clamping, is adopted to drain amplified lightning stroke current and to ensure a lower residual voltage value; the over / under-voltage protection of the control of a power supply management module on the power supply module is adopted to prevent the influence from input voltage jumping; meanwhile; the wave filtering mode combining the low-frequency filtered wave and the high-frequency filtered wave is adopted to effectively solve the problems of protection from lightning stoke damage in the direct current power supply for the communication equipment and high-low frequency interference.