The world fastest limiting and switching device Explosive Bridge

Short Description:

Explosive Bridge As shown within the dotted lines in Figure 1, a high-capacity fast switching device consist of a bridge FS, a fuse FU, a nonlinear resistor FR, and a testing and control unit CT.


  • FOB Price: US $1000 -9,999 / Piece
  • Min.Order Quantity: 1Sets
  • Supply Ability: 300Pieces per Month
  • Production cycle: 15-45 Days
  • Product Detail

    Explosive Bridge

    What is a high-capacity fast switching device

    As shown within the dotted lines in Figure 1, a high-capacity fast switching device consist of a bridge FS, a fuse FU, a nonlinear resistor FR, and a testing and control unit CT. The device is abbreviated HDF and its symbol is   图片13  .

    Bridge

        Under normal circumstances, the bridge has the eectric current flow through it. In case of a short circuit, the bridge disconnects quickly within 0.15 ms.

    Fuse

       The short circuit current is diverted to The fuse upon the bridge’s disconnection.

    It fuses within 0.5 ms and produces an adequate arc pressure.

    图片2

    Nonlinear resistor

       The arc pressure produced by fusing absorbs the magnetic field and limits the overvoltage occurring at the disconnection within an allowable level.

    Testing and control unit

       This unit monitors the electric current and its rate of change. It sends a disconnecting signal to the bridge in case of malfunction.

    图片1

     Features of high-capacity fast switching device

    Due to its new principle, advanced technology and fine design, the high-capacity fast switching device is superior to a conventional protector with a breaker plus a relay.

      

    20 times faster

       The failure current is broken within 1 ms and drops to 0 within 3 ms, and the failure is completely eliminated.

       The conventional protector with a breaker Plus a relay would take at least 60 ms to break a failure current.

     Higher sensitivity with currents rate of change closely monitored When a failure current occurs, an increased rate of change is shown.

     图片3                                                           

    Optimal design and higher reliability

       When a current has its amplitude and rate of change exceed the normal values at the same time, it is judged a short circuit.

       The three identical independent testing and control elements will judge a failure based on their “votes”, and set off a disconnecting signal without error.

     

    Unlimited breaking capacity

    Normal working current flows through the bridge.

    The arc pressure produced by the high breaking capacity fuse will close the nonlinear resistor, which will distinguish the arc of the fuse.

    Once equipped with a nonlinear resistor to absorbs the magnetic field, the breaking capacity may be substantially enlarged.

     

    The system will never experience an anticipated impact current.

       

       The failure current is broken within1 ms and drops to 0 subsequently.The breaking current value l p will be onlyabout one tenth of the peak short circuit

    value l max.

       The system will experience a much smaller electric force,with the passed l2t being only one several thousandth of that in a breaker-type protector.

     图片4

    No damaging overvoltage in the process of disconnection

       The zinc oxide nonlinear resistor will limit the over voltage within the 2.5-time rated phase voltage specified by the national standard. 

    Advantages of high-capacity fast switching devices used in electric systems

    Much lower investment

       The mechanical strength design of the electric equipment may be slackened as the equipment with this device will not be impacted by any strong short circuit current.

       The size of the conductor may be reduced due to the electric equipment’s fast disconnection and lower breaking current that eliminate the problem of thermal instability.

     Protection for large electric generators against outlet short circuit 

       With a large breaking capacity,it is an ideal breaking device for electric generator outlets and

    substations.

       Electric generators and transformers areprotected fast and effectively.

     图片5

    Much lower investment requirement for system expansions and network operations 

     At a short circuit, HDF quickly Disconnects a system with the load-side breaker handling a short

    circuit current of  a single transformer. It will not be necessary to replace the Original switching equipment for system expansions. Electric systems’ reliability will be raised With reduced voltage drops at heavy load starting.Operations will be more economical.

           图片6

    Parallel connection of HDF and reactor as the most economical and efficient limiting scheme 

     

       Normally, HDF short connects the reactor to avoid huge power consumption by the reactor and the voltage drop at the starting of a large motor.At a short circuit, HDFdisconnects quicklyand the load-side breaker’s breaking current is limited by the reactor within allowable levels.

    In the design of a new power supply system, the impedance of the reactor may be raised to help

    further reduce the load-side breaker’s breaking current,thereby reducing the cost.   

    图片7

    Higher quality of power supply for important loads that do not allow any instant outage or that require forced auto-starting 

    At a short circuit, HDF disconnects quickly and activates the reactor.The residual voltage on the reactor may be designed to a level that is sufficientTo maintain the operation of an important load.

     图片8

    Model specifications and technical parameters

     图片9 

    Technical parameters

     图片10 

    Construction of high-capacity fast switching device

     图片11

            Non-cabinet construction 

     图片12 

    Cabinet-type construction 

      \

    Operational Environment

    Ambient temperature:  -40℃ ~ 50℃

    Altitude: not more than 1,000 meters; special design neededforaltitude of over 1,000 m.

    Environmental conditions: free from dust, corrosive gas, steam, or explosive gas

    Installation: indoors

    Relative humidity: 90%

     

    Packaging, transportation and storage 

    To be packed in wooden case, with the cabinet base fastened to the bottom panel of the package.

    Not to be transported over long distance on highways below grade three.

    May be repacked for shipping as necessary.

    To be stored in a dry warehouse with good ventilation if not used for a long time. Not to be stored outdoors for long. Main components of HDF shall be free from collision, dampness or exposure to the sun when in transportation.

     

    Selection of parameters and technical service

    Our HDF design shall accommodate parameters of customer’s generator, transformer and line arrangements.

    Cabinet design shall be made according to the size of the customer’s installation site.

    Assistance and technical guidance may be provided on request for on-site installation and testing.

    The bridge’s disconnecting signal must not be open circuited. It should be safely shorted for installation and testing.

     

    Instructions for ordering

    Customers shall provide parameters/drawings of their generator, transformer and site line arrangements. 

    Customers shall indicate types, specifications and quantity of spare parts they need.


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