Protection device of energy-storage capacitor unit
A technology for energy storage capacitors and protection devices, which is applied in the direction of emergency protection circuit devices, circuit devices, emergency protection circuit devices for limiting overcurrent/overvoltage, etc., and can solve high overvoltage, inter-turn insulation breakdown of inductance, Fault expansion and other issues
Inactive Publication Date: 2009-12-30
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology
In the process of cutting the short-circuit fault of the fuse, the voltage at both ends of the fuse is too high, which will cause a high overvoltage at both ends of the inductor, resulting in the breakdown of the insulation between the turns of the inductor and an explosion; at the same time, it will cause the function of the fuse to fail and cannot be cut off. circuit, allowing faults to expand
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[0012] Example: 34 capacitors run in parallel, each capacitor is 110uF, the working voltage is 23.5kV, the sum of the resistance of the fuse and the inductance on each branch is 112mΩ, and the sum of the inductance is 73uH. The insulation withstand voltage level of the inductor is designed to be 2.5 times the normal working voltage of the capacitor, that is, 58.75kV. According to the above parameter design, the DC 1mA voltage of the arrester is 23.5~36.7kV, and the lightning impulse current residual voltage is 37.6~58.75kV. The specific values are taken according to the pressure ratio that can be achieved by the ZnO valve produced by the manufacturer within the above range. Since the current residual voltage of the lightning impulse current and the DC 1mA voltage are generally 1.6-2.0, if the DC 1mA voltage of the arrester is taken as 23.5kV, the lightning impulse residual voltage can be taken as (1.6~2)×23.5=37.6~47kV, If the lightning impulse residual voltage of the arrest...
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This invention relates to a protection device of an energy-storage capacitor set, in which, N equivalent capacitors operate in parallel, a fuse and an equivalent inductor are serial on the branch of capacitors, arresters are parallel at both ends of the inductor, and the 1mA reference voltage of the arrester is not less than the normal working voltage UC of the capacitors, remnant voltage of thunder impulsion current is not greater than the insulation voltage-holding level of the inductor, the fuse cuts short-circuit current when the impulsion current volume of the arrester is (0.7-1.5)x1 / 2LI2 and in short circuit, the inductor limits rising rate of the short-circuit current, when the voltage at either end of the inductor reaches to a set value, the arrester operates to limit the voltage at its limit protection region so as to avoid explosion.
Description
technical field [0001] The invention belongs to a protection device for a power supply system, in particular to a protection device for an energy storage capacitor bank. Background technique [0002] The power supply system of capacitor energy storage uses hundreds of capacitors connected in parallel to provide energy, and works in the state of high-voltage pulse and high current. The life of capacitors is greatly shortened due to aging and misoperation, resulting in internal breakdown and short circuit or even explosion. Even if the circuit components The loss of the bus and the busbar is huge, and it also endangers personal safety. Similar failures have occurred on NIF devices in the United States and laser fusion power devices in my country. The greater the energy storage density and energy of the capacitor, the greater the loss caused, so the protection of the capacitor is very important. [0003] For existing energy storage capacitor bank protection devices, see Qin S...
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IPC IPC(8): H02H7/00H02H7/06H02H3/08H02H9/02H02H9/04
Inventor 潘垣林福昌郭锐何俊佳夏胜国
Owner HUAZHONG UNIV OF SCI & TECH