摘要:
A surge protective device (SPD) module includes a varistor and an electrical conductor. The varistor includes a hole defined therein and extending through the varistor. The electrical conductor extends through the hole in the varistor.
摘要:
A two-segment magnetic trip mechanism, comprising a coil assembly having a coil front segment a coil rear segment; and a voltage limiting element, wherein the coil front segment and the coil rear segment are electrically connected with each other, the number of turns of the coil front segment being greater than the number of turns of the coil rear segment, and the voltage limiting element is connected in parallel with the coil front segment. A backup protector comprising such a two-segment magnetic trip mechanism is also disclosed.
摘要:
A high-speed current shunt comprises a flat conductive metal strap having a first and a second electrode at each end of said strap for connection to an external circuit for receiving current through the strap, said strap having a defined current-measuring region extending from a first linear position to a second linear position along the length of the strap. The high-speed current shunt also comprises a tapered parallel-plate transmission-line impedance-matching transformer, comprising first and second plates tapered in shape and having a wide end and a narrow end, relative to one another, each tapered plate having a length approximately 10 times that of width of said metal strap, said first plate being attached at its wide end to said first linear position of the defined measuring region by a solder and said second plate being attached at its wide end to said second linear position of the defined measuring region by a solder, and a coaxial cable with a center conductor being attached by a solder to the narrow end of the first plate, and a shield being attached by a solder to the narrow end of the second plate.
摘要:
The invention relates to a switching device for overvoltage arresters, consisting of mechanically prestressed first switching elements which have surge current capability and form, with the arrester(s) of the overvoltage arrester, a series circuit of a surge current path, and a fault current path connected to the series circuit. According to the invention, second switching elements are arranged in the fault current path and are mechanically coupled to the first switching elements in such a manner that, in the case of lasting impermissible loads on the arresters of the overvoltage arrester in the surge current path, the first switching element(s) is/are triggered with the consequence of DC isolation of the surge current path from the respective network.
摘要:
A surge protection device (100) with short-circuit protection function. The surge protection device comprises a surge protection module (102) and a short-circuit current protection module (101). The surge protection module discharges and suppresses a surge current and voltage, and the surge protection module is a plug-in type module. The short-circuit current protection module is integrated in a pedestal, and the short-circuit current protection module provides short-circuit protection and plug-in mounting for the surge protection module. The surge protection device overcomes the problems such as impact current brought by using an external overcurrent protection device as backup protection, while the surge protection device has a strong current limiting capacity, a good short-circuit breaking capacity, and a small minimal instantaneous tripping current value. The surge protection device can withstand a failure mode occurring in a temporary overvoltage (TOV), and can also play the role of protection in the case of a low current.
摘要:
A high-speed current shunt comprises a flat conductive metal strap having a first and a second electrode at each end of said strap for connection to an external circuit for receiving current through the strap, said strap having a defined current-measuring region extending from a first linear position to a second linear position along the length of the strap. The high-speed current shunt also comprises a tapered parallel-plate transmission-line impedance-matching transformer, comprising first and second plates tapered in shape and having a wide end and a narrow end, relative to one another, each tapered plate having a length approximately 10 times that of width of said metal strap, said first plate being attached at its wide end to said first linear position of the defined measuring region by a solder and said second plate being attached at its wide end to said second linear position of the defined measuring region by a solder, and a coaxial cable with a center conductor being attached by a solder to the narrow end of the first plate, and a shield being attached by a solder to the narrow end of the second plate.